Stata generate date variable
[PDF File]Forecasting in STATA: Tools and Tricks - SSCC
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New variables can be created by using the generate command. For example, to take the log of the variable gdp: . generate y=ln(gdp) Dates and Time For time‐series analysis, dates and times are critical. You need to have one variable which records the time index. We describe how to create this series. Annual Data
[PDF File]Forecasting in STATA: Tools and Tricks - SSCC
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In STATA, each time you generate a graph, the default is to close the existing graph window and draw the new one. To keep an existing graph, use the command ... The variable sex is coded 1 for men and 2 for women. To select just the men, we ... When formatted as a date, STATA displays quarterly time periods as “1957q2”, meaning the second ...
[PDF File]Title stata.com Date and time functions
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d date (days since 01jan1960) of the start of half-year e h dofm(e m) the e d date (days since 01jan1960) of the start of month e m dofq(e ... Stata’s date and time functions are described with examples in [U] 25 Working with dates and times,[D] Datetime,[D] Datetime durations, and[D] Datetime relative dates. What follows is a
[PDF File]Some Stata Commands, Statistics 220 - University of Chicago
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generate case= _n or, using an abbreviation, gen case=_n ii. Multiply values in varnameX by and add , store results in varnameY : gen varnameY = a+ b * varnameX iii. Generate a variable with all values 0: gen varname1 =0 iv. Generate a variable with values 0 unless varname2 is greater than , then make the value 1: gen varname1 =0
[PDF File]Useful Stata Commands for Longitudinal Data Analysis - LMU
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Load datacd $pfad1 //$pfad1 is expanded to “I:\Daten\...”use Happiness, clear Working with date functions Date information is transformed in “elapsed months since Jan. 1960”gen birth = ym(birthy,birthm) //mdy(M,D,Y) if you have also daysgen birthc=birthformat birthc %tm //%td if you have elapsed days
[PDF File]Getting Started with Stata - Sacramento State
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**Generate single time series date variable generate mydate=ym(year,month) (this command assumes you have two separate variables – ‘year’ and ‘month’ – that define a monthly time series… see http://dss.princeton.edu/online_help/analysis/time_series_data.htm for other formats) **Tell Stata you have monthly time series data tsset mydate, monthly
[PDF File](v. 1.0) - Princeton University
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* Create a dummy variable to indicate the time when the treatment started. Lets assume that treatment started in 1994. In this case, years before 1994 will have a value of 0 and 1994+ a 1. If you already have this skip this step. gen time = (year>=1994) & !missing(year) * Create a dummy variable to identify the group exposed to the treatment. In
[PDF File]An Introduction to Stata - MIT
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Instead of typing “generate var2 = 2*var1” each time you want to generate some variable var2 which is equal to 2*var1, you could write a simple program to do it for you. The code would look as follows (assume we name our program times2): program define times2 /* times2 takes arguments old_var new_var*/ generate `2’ = 2*`1’
[PDF File]StataTutorial - Princeton University
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variable name type format label variable label region byte %12.0g region Region country str28 %28s Country popgrowth float %9.0g * Avg. annual % growth lexp byte %9.0g * Life expectancy at birth gnppc float %9.0g * GNP per capita safewater byte %9.0g * * indicated variables have notes Sorted by: Weseethatwehavesixvariables.
[PDF File]Working with dates and times - Stata
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Variabledtis a variable we can use in calculations. Say we wanted to know how many hours it hadbeen since the previous action: . sort dt. generate hours = hours(dt - dt[_n-1]) missing value generated). format hours %9.2f. list id dt action hours
[PDF File]Title stata.com generate — Create or change contents of variable
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generate double newv4 = cofd(date) + time Menu generate Data>Create or change data>Create new variable replace Data>Create or change data>Change contents of variable Syntax Create new variable generate type newvar :lblname =exp if in , before(varname)jafter(varname) Replace contents of existing variable
[PDF File]Creating new variables - Stata
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the most basic form for creating new variables isgeneratenewvar =exp, where expis any kindof expression. of course, bothgenerateandreplacecan be used withifandinqualifiers. anexpression is a formula made up of constants, existing variables, operators, and functions. someexamples of expressions (using variables from theautodataset) would be2 + …
[PDF File]Title stata.com generate — Create or change contents of variable
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generatecreates a new variable. the values of the variable are specified by=exp.if notypeis specified, the new variable type is determined by the type of result returned by=exp.afloatvariable (or adouble, according toset type) is created if the result is numeric, and astring variable is created if the result is a string. in the latter case, if the …
[PDF File]1.1.1 Defining Time-Series in Stata
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The quarterly data begin in the second quarter of 1985. To establish dates and convert all of the variables to time-series use: generate date = tq(1985q2) + _n-1 list date in 1 format %tq date list date in 1 tsset date . generate date = tq(1985q2) + _n-1 . list date in 1 date 1. 101 . format %tq date . list date in 1
[PDF File]DescriptionQuick startSyntaxRemarks and examplesAlso see
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Calculate the date of a birthday in the year given by numeric variableybased on a numericallyencoded Stata date variabledobthat gives date of birth generate bday_future = birthday(dob, y) As above, but for persons born on 29feb have their birthdays on 28feb in nonleap years (rather thanthe default of 01mar)
[PDF File]Datetime conversion — Converting strings to Stata dates
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You usegenerateto create the Stata date variables. The conversion functions are used in theexpressions, such as . generate double time_admitted = clock(time_admitted_str, "DMYhms"). format time_admitted %tc. generate date_hired = date(date_hired_str, "MDY"). format date_hired %td
[PDF File]Creating Indicator Variables in Stata
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Creating Indicator Variables in Stata Example from Appendix C4 includes Y = GPA for 1st year, X1 = ACT test score (taken before admission) Categorical variable = “Year” = year of admission, from 1996 to 2000 (5 categories) Here are separate plots of Y = GPA and X = ACT for each admission year:
[PDF File]Working with dates and times - Stata
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Using our new%tdvariable, we can create a variable recording how old each of these subjectswas on 01jan2000: . gen age2000 = (td(1jan2000)-birthday)/365.25. list td()is a function that makes it easy to type%tddates. There are also functionstc(),tC(),tw(),tm(),tq(), andth()for the other%tformats; see[D] datetime.
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