ࡱ> ` R6bjbj8@qa 0 K K K8DKLd`N|TTTTVW&XL$7h:;]VV;];]:TT4?eee;] TTe;]eeVl@rmTTN I/ KGam r$U0mTbrmrm0orXZe[\;rXrXrX::drXrXrX;];];];] 66r, Correlations among direct input coefficients and its applications to update IO tables: a empirical investigation (Draft) Xu Jian Lu, Xiaolin AbstractCoefficient change in input-output model has attracted wide attention, but there is relative little research on correlations among change in direct input coefficients. This paper applies some important correlation measures including Pearson's correlation coefficient, Spearman's rank correlation coefficient and Kendall coefficient to investigate correlations among direct input coefficients based on Chinese national input-output tables for 1992,1995,1997,2002 and 2005. Several coefficient groups consisted of those direct input coefficients with strong correlations each other are identified and the reasons of existing correlation are proposed. Identifying correlations among direct input coefficients has important meanings in many aspects. For example, it will provide new information when updating IO tables. This paper improve traditional updating procedures by introduce coefficient correlations information. Better performance of new procedure is proved. Introduction As a method of quantitative analysis proposed by Leontief (1936), the input-output model can clearly reflect the complete interconnection between sectors in the economic system, and the concept of direct consumption coefficient is the core of the input-output analysis, which illustrates the direct linkages among economic sectors. Therefore, many scholars focus their researches on the direct consumption coefficient such as what is the trend as the coefficients changing with time, does the coefficients are stable as time goes on, if it is not, what are the effect factors. In allusion to these issues, following studies have been presented. Pan Wenqin, Li zinai(2001) considered the intermediate consumption of all sectors to Agriculture, Mining and Light industry was basically stable or have little decrease and to Heavy industry (especially Chemical and Manufacturing industry ), Water, Electricity supply and Services increased slowly by analyzing the change of direct consumption of Japan and comparing the fluctuation rules of direct consumption coefficients between China and Japan during 1990 to 1995. Wang Haijian(1999) comparatively analyzed the direct consumption coefficients dynamically of China ,America and Japan and demonstrated the fluctuation rules of direct consumption coefficient during 1981 to 1992. Duan Zhigang, Li Shantong (2006) deemed that the intermediate input rate increased in a mass of sectors in China ,however, there were significant difference in the scale of direct input coefficients among economic sectors with the economic development from 1992 to 2000.Bon.R(1986),Bon.R, Xu Bing(1993), Bon.R,Tomonari.Y(1996) adopted absolute forecast error to comparatively analyze the relative stability between technology and distribution coefficients in the context of demand-driven and supply-driven models , and pointed out that in less mature industries, both kinds of coefficients matrixes in the context of demand-driven model are much more stable than that in the context of supply-driven model, and vice visa . Based on Bons research, Erik(2006) made a comparative analysis of coefficient stability between demand-driven and supply-driven models by introducing index RMSE(root mean squared error). Li shantong,etc(2006) also did some researches on coefficient stability of China. Sawyer1992 analyzed the trends of physical and valued coefficients by constructing VAR and demonstrated that price and income effects are the leading cause of coefficient instability. However, scholars pay little attention to the coefficient correlation which is notably reflected in the Biproportional Scaling Method (RAS) and Important Coefficients Selection. On the one hand, the alternative multipliers and the manufacturing multipliers in the iteration of RAS own their correlation modes, on the other hand, the important coefficients should be selected by series as the highly correlation among coefficients instead of selecting one by one. So its very possible that not only some kind of correlation among coefficients is exist but also improved accuracy of updating data in input-output tables and the changed mode of selecting important coefficients may be come true in view of such correlation. Hence, this paper is to verify the scale of coefficients correlation by introducing index Kendall and update the input-output tables based on such correlation to improve the accuracy of RAS by using current-price input-output tables of China from 1987 to 2005. This paper organized as follows: section two describes the methodology and the general indexes of measuring correlation. Following this exposition, empirically analyzing the coefficient correlation of Chinese input-output tables using index Kendall, then, an application of coefficient correlation in updating input-output tables by adding constraint conditions in RAS will be revealed. Some summary remarks complete the paper. 2. Measures of Correlation Whether two variables are related is widely used in many fields of research. Statisticians usually use correlation coefficient to measure the relationship between two variables. There are three widely used measures of correlations, namely Pearsons correlation coefficient, Spearmans correlation coefficient and Kendall Tau. Pearsons Correlation Coefficient Pearsons correlation coefficient often used to measure the strength and direction of the linear relationship between two variables. Given a sample EMBED Equation.DSMT4 , then the formula can be written as follows:  EMBED Equation.DSMT4  where  EMBED Equation.DSMT4  is the average of each sample . Using the notation in this article, the formula can be written as follows:  EMBED Equation.DSMT4  where  EMBED Equation.DSMT4  is the direct input coefficient in year t ,and  EMBED Equation.DSMT4 is the average of the  EMBED Equation.DSMT4 in each year. But it can be seriously affected by a outlier, non-normality and non-linearity. Spearmans Correlation Coefficient Pearsons correlation coefficient can only measure the strength and direction of the linear relationship between two variables. But whether two variables have association (not only linear correlation) always be paid more attention. Spearmans correlation coefficient is a useful measure in case of the relationship is not linear but monotonic. It is robust and efficiency, thus it can resist the influence of the outlier, non-normality and non-linearity. Take the same sample in2.1.1, the Spearmans correlation coefficient can be computed by the following formula,  EMBED Equation.DSMT4  where  EMBED Equation.DSMT4 is the rank of  EMBED Equation.DSMT4 , and  EMBED Equation.DSMT4  is the average of EMBED Equation.DSMT4 . Using the notation in this article, the formula can be written as follows:  EMBED Equation.DSMT4  where  EMBED Equation.DSMT4 is the rank of  EMBED Equation.DSMT4 , and  EMBED Equation.DSMT4 is the average of the EMBED Equation.DSMT4 in each year. Kendall Tau Kendall Tau is also robust and efficiency. It can describe the relationship regardless of any assumptions on the frequency distribution or the requirement that the variable is linear. It can be computed by the formula as follows:  EMBED Equation.DSMT4  where  EMBED Equation.DSMT4  stands for the concordant pairs, and  EMBED Equation.DSMT4  stands for the discordant pairs. Since the data simple size discussed in the article is small and numerical is also small, Kendall Tau has substantial advantage over Spearmans correlation coefficient. So Kendall Tau is used in the article. 3. The empirical results of correlation in coefficients for China For our empirical analysis, we have measured the Kendall coefficients for the input-output tables of China. The original tables were published in a version recording 62 sectors with constant prices, for the years 1987,1992,1997,2002 and 2005. As for input-output tables with 62 sectors, there are 3844 direct input coefficients in total, however, most of which are next to zero. Generally speaking, compared with big coefficients, there is nearly no regularity in change in small coefficients for the reason that they are more easily influenced by error. Furthermore, small coefficients contribute less to correlative analysis, which means that they are low in practical application. Nevertheless, the aim of our empirical analysis is to find whether there is, to some extent, correlativity between direct input coefficients; if it does exist, then we aim to find the relevant correlative mode, and further apply it to updating tables. For that purpose, it seems appropriate to compute Kendall coefficient between big coefficients. That is, Kendall coefficient is taken into account only if the averages of these coefficients among the five years are sufficiently large, using a threshold value 0.1. Thus as far as the sample is concerned, there are 71 coefficients in line with the above criterion. We use Kendall coefficient to measure the correlativity between these 71 coefficients. In a sample containing data of five years we can form 10 pairs. The maximum Kendall coefficient value 1 is achieved if all pairs are concordant (i.e., the agreement between two coefficients is perfect). Correspondingly the minimum Kendall coefficient value -1 is achieved if all pairs are discordant (i.e., the disagreement between two coefficients is perfect). In consideration of above two cases, whether the Kendall coefficient is positive or not, they represent the total correlativity between two coefficients. For all other cases the Kendall coefficient value lies between -1 and 1. A preponderance of concordant pairs indicates a strong positive relationship between two coefficients; a preponderance of discordant pairs indicates a strong negative relationship between two coefficients; if two coefficients are completely independent, the Kendall coefficient has value 0. For example, if the 10 pairs are composed of 9 concordant pairs and 1 discordant pairs, then EMBED Equation.DSMT4 , and so on. Given that our sample is small, coefficients are considered as correlative only in the case that the absolute value of Kendall coefficient is 1 for the purpose of controlling the influence of occasionality. Therefore, according to all criteria the above mentioned, we can get the empirical results of the correlativity in coefficients for China. Detailed information on groups of correlative coefficients is given in Table1. As we can see, there are 14 totally correlative groups among 71 big coefficients. Different groups differ in the number of coefficients included, of which the maximum is 11 and the minimum is 2. Table1. The detailed information on groups of correlative coefficients No. of GroupThe number of coefficients includedCoefficients included111 EMBED Equation.3   EMBED Equation.3   EMBED Equation.3   EMBED Equation.3   EMBED Equation.3   EMBED Equation.3   EMBED Equation.3   EMBED Equation.3   EMBED Equation.3   EMBED Equation.3   EMBED Equation.3 210 EMBED Equation.3   EMBED Equation.3   EMBED Equation.3   EMBED Equation.3   EMBED Equation.3   EMBED Equation.3   EMBED Equation.3   EMBED Equation.3   EMBED Equation.3   EMBED Equation.3 36 EMBED Equation.3   EMBED Equation.3   EMBED Equation.3   EMBED Equation.3   EMBED Equation.3   EMBED Equation.3 45 EMBED Equation.3   EMBED Equation.3   EMBED Equation.3   EMBED Equation.3   EMBED Equation.3 54 EMBED Equation.3   EMBED Equation.3   EMBED Equation.3   EMBED Equation.3 63 EMBED Equation.3   EMBED Equation.3   EMBED Equation.3 73 EMBED Equation.3   EMBED Equation.3   EMBED Equation.3 82 EMBED Equation.3   EMBED Equation.3 92 EMBED Equation.3   EMBED Equation.3 102 EMBED Equation.3   EMBED Equation.3 112 EMBED Equation.3   EMBED Equation.3 122 EMBED Equation.3   EMBED Equation.3 132 EMBED Equation.3   EMBED Equation.3 142 EMBED Equation.3   EMBED Equation.3  EMBED Equation.3 represents the direct input coefficient measuring the input from sector EMBED Equation.3  in sector EMBED Equation.3 , per unit of sector EMBED Equation.3 s output. The sector each number stands for is shown in appendix. From Table1, it is evident that there are 56 coefficients that are correlative at least one other coefficient. So the phenomenon of correlativity in the change of direct input coefficients is universal, which cant be ignored. In addition, the absolute value of Kendall coefficient is 1 within each group, that is to say, there are both totally positive correlativity and totally negative correlativity. Note that different groups have different modes of correlativity. In the following we will take the two largest groups as examples and concentrate on their modes of correlativity. Now lets begin with Group1. Table2 shows the detailed correlative structure of Group1. The 11 coefficients included are divided into two subgroups: A and B. As a result, only totally positive correlativity exists within subgroup A and subgroup B. But for any coefficient belonging to A, the correlativity with that from B is totally negative. Table2. The correlative structure of Group1 Group1isectorjsectorASmelting and Rolling of Non-Ferrous MetalsSmelting and Rolling of Non-Ferrous MetalsSmelting and Rolling of Ferrous Metal OresSmelting and Rolling of Ferrous Metal OresAgricultureManufacture of RubberSmelting and Rolling of Ferrous Metal OresManufacture of Other General Purpose MachineryBManufacture of Other Chemical Raw Materials and Chemical ProductsManufacture of PesticidesSmelting and Rolling of Non-Ferrous MetalsManufacture of Other Electrical Machinery and EquipmentManufacture of Other Transport EquipmentManufacture of Other Transport EquipmentManufacture of MedicinesManufacture of MedicinesAgricultureAgricultureSmelting and Rolling of Ferrous Metal OresManufacture of Metalworking MachineryManufacture of Other Electrical Machinery and EquipmentManufacture of Household Audiovisual Apparatus Figure1 exhibits a closer inspection of the mode of change in coefficients from subgroup A, which vividly explains the correlativity within A. As we can see, from 1987 to 1992, all coefficients go up. But they all fall rapidly by more than the range of the above increase from 1992 to 1997. Note that the Kendall coefficient value wont always be 1 within A if all coefficients decrease without satisfying the demand for the range. Then from 1997 all coefficients go up slowly only to end up below their initial points. From Figure1, it is obvious that the overall trend for all coefficients is perfectly consistent for any two years, which are not necessary to be adjacent. Figure1.The mode of change in coefficients from subgroup A  The same fact that the overall trend for all coefficients is perfectly consistent also holds for subgroup B, which is shown in Figure2. Figure2. The mode of change in coefficients from subgroup B  For the moment lets turn to the analysis of totally negative correlativity by comparing the changing tendency of coefficients from A and B, which is given in Figure3. Here we take  EMBED Equation.DSMT4 from A and  EMBED Equation.DSMT4  as an example. As we can see, the disagreement is perfect, i.e., one changing tendency is the reverse of the other. Figure3. Comparison of the mode of change between coefficients from A and B  Similar analysis is carried out on Group2. Thus, it is not necessary to give more details. In what follows, we just list the relevant outcomes. Table3. The correlative structure of Group2 Group2isectorjsectorAManufacture of Communication and Other Electronic EquipmentManufacture of Household Audiovisual ApparatusAgricultureManufacture of Other DrinksManufacture of TextileManufacture of Articles for Culture, Education and Sports ActivitiesWholesale and Retail TradesManufacture of Measuring InstrumentsBManufacture of Communication and Other Electronic EquipmentManufacture of ComputerProcessing of Timbers and Manufacture of FurnitureProcessing of Timbers and Manufacture of FurnitureManufacture of Paper and Paper ProductsManufacture of Paper and Paper ProductsManufacture of PlasticManufacture of PlasticSmelting and Rolling of Ferrous Metal OresManufacture of Other Special Purpose MachineryManufacture of Communication and Other Electronic EquipmentManufacture of Machinery for Cultural Activity & Office Work Figure4.The mode of change in coefficients from subgroup A  Figure5.The mode of change in coefficients from subgroup B  On the whole, Group1 and Group2 differ in correlative mode. For any two coefficients, it is evident that once their overall trends are monotonic, their Kendall coefficient has absolute value 1. And this holds for coefficients from Group2. As a result, such a correlativity happens more likely to be spurious correlation, which indicates that no regular connection really exists. However, Group1 is rather different. As we have seen, there are two turning points during the five years. Under such a circumstance, there is little chance of total agreement or total disagreement due to occasionality, which means that certain inner connection between coefficients, or even real correlativity, does exist. Of course, whether it is an effect relationship or not, further research is needed. At last, we are interested to know whether the correlative mode we have found is useful in updating tables. Speaking of updating tables, as we all know, RAS method is widely used to update input-output tables through substitution multipliers and manufacturing multipliers, which assumes the existence of some correlative mode in fact. Then it is relevant to know whether the correlative mode we have found is in accordance with that implied in RAS method, or whether it is realizable to get the real correlative mode through RAS method. In the following, we apply RAS method to updating tables. Setting 1987 as the base year, the RAS procedure is: given the direct input coefficient matrix of the base year and given the gross output, total intermediate use, and total intermediate inputs for the years 1992, 1997, 2002 and 2005- estimate the input coefficient matrices for the years 1992, 1997, 2002 and 2005. Thus we get a new sample. Then similar correlative analysis is done on 71 coefficients based on this new sample. As a consequence, we find that the correlative mode implied in RAS method differs greatly with the real one, which indicates that the correlativity we have found cant be fully explained by substitution multipliers and manufacturing multipliers under RAS method. So it is very useful to apply correlativity to updating procedure, which will undoubtedly improve the accuracy. 4. The application in the update of input-output table To compile the input-output table by Survey Methods is a very time-consuming and money consuming task. For most countries, the IO table can only be compiled once every few years, and there will be at least 2-3 years from the published year to the compiled year. Which makes the IO table cannot form a time series, limiting the scope of application of input-output table; at the same time, several years of lagging may also lead to serious bias in the results. To reduce the costs of input-output tables, and improve the timing characteristics of input-output tables, many researchers have explored the use of Non-Survey Methods to update input-output tables. The most widely used methods are Biproportional Scaling Method (RAS Method) and Entropy Method. In fact, its been proved that there is no big difference between the two methods. As RAS method can be a special case of entropy, which is a minimum cross entropy method with slightly differences on the objective function. g >f:y[^vbNW[&{vb For either non-survey methods, to updating the IO tables is to updating the coefficient matrix. The study on correlation of direct consumption coefficients can introduce constraints to narrow the solution space, in order to get more realistic results. This section discuss the application of the correlation of direct consumption coefficients on updating the IO table, introducing the constraints of the correlation into the entropy method. 4.1 Entropy, Maximum Entropy Method and Minimum Cross Entropy Method Entropy is a measure of information. In terms of discrete distribution, the entropy of a discrete random variable g is:  EMBED Equation.3  4.1 The range of the discrete random variable is n, pi is the probability of the occurrence of the i-values . Generally speaking, that the entropy is 0 means completely sure, full of information; when all events are equal probability (the case of least information), the entropy reaches the maximum. The greater the number of events, the closer the entropy approaches infinite, which means the greater degree of uncertainty, none of information. Cross Entropy depicts the gap of information between two distributions. 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The direct representation of maximum entropy principle is: taking the entropy as the objective function and the probability distribution as the object to solve, under certain constraints, the optimal solution is the probability distribution which maximizes the entropy. Minimum cross entropy principle requires the probability distribution which minimizes the cross-entropy as its optimal solution. Under certain conditions, the maximum entropy principle and the minimum cross-entropy principle are consistent. 4.2 The entropy method of updating input-output table Golan, et al (1994) proposed that both maximum entropy principle and minimum cross-entropy principle can be used to update the input-output table. Considering the prior information, the minimum cross-entropy principle is more widely used. The objective function and constraints of Maximum entropy method are:  EMBED Equation.3  4.3  EMBED Equation.3   EMBED Equation.3  4.4  EMBED Equation.3  4.5 View from the objective function, this function can be interpreted as the addition of n entropy in the simplest way, is the summation of entropy. View from the constraints, equation (4.4) is a line constraint. When updating an input-output table, aij are the direct consumption coefficients and xi* are the total intermediate demand on i sector of target year, both of which are known. Equation (4.4) ensures that, as for the matrix I, the summation by rows is equal to xi*. Equation (4.5) is a column constraint. x*j are the total intermediate input on j sector of target year, and are known. Equation (4.5) ensures that, as for the matrix I, the summation by columns is equal to x*j. Under the constraints above, we can get the coefficient matrix which maximizes the objective function represented by equation (4.3). Compared with the maximum entropy method, the minimum cross-entropy methods are standard matrix update method. 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