ࡱ> ^`]y bjbjEE .''"J9}++8OlM6GUUUU&&&|4~4~4~4~4~4~4$E794e&&^&&&4++UUC 6*0*0*0&0+ UU|4*0&|4*0*07*0U &+N*0h460M6*0m:t,m:*0*0"m:L0&&*0&&&&&44/ &&&M6&&&&m:&&&&&&&&& : Understanding the Formulas for the CFP Certification Examination By David W. Durr, Ph.D., CFA, CFP Dividend discount model (a.k.a. Constant Growth Model, Gordon Growth Model)  EMBED Equation.3  The V in this formula represents value. Sometimes a P (representing Price) is used instead of a V. In the formula D1 is the dividend that is expected next period (that is, at time period one). In the denominator, r represents the required rate of return. This is the rate that investors require before they will invest in this particular stock. In a test question, this rate will either be given, or the student will be expected to calculate the required rate of return using the capital asset pricing model (CAPM). As is common in other formulas, sometimes rates are represented by letters other than r. It is quite common to see a k used instead of r. The g in the formula is the rate of constant growth. This rate will most likely be given. However, it is possible that you could be given past dividends and then be expected to solve for the growth rate. This is not a problem. Simply use the time value of money functions on your calculator. Sometimes in the problems you are given the dividend in the current period (D0) and you are expected to calculate next periods dividend (D1). This is quite easy. Simply multiply the current dividend by one plus the growth rate. That is: D1 = D0 (1+g). Expected rate of return  EMBED Equation.3  This formula is really a manipulation of the dividend discount model. In this formula we know the stock price and we are solving for the rate of return. As before, D1 is the dividend that is expected next period. Also, g is the constant rate of growth. Notice that this formula uses P to represent stock price. Remember that dividend divided by price gives us the dividend yield. So, this formula says that the expected rate of return on this stock is equal to the expected dividend yield plus a growth factor. This is consistent with what we know about investing in equity securities. The return to an equity investor will come from either the dividend yield and/or the growth in the value of the asset (capital appreciation). Covariance  EMBED Equation.3  Covariance is a measure of how much two assets move together. It is a measure that combines the volatility of one stocks returns with the tendency of those returns to move up or down at the same time that another stocks returns move up or down. The covariance of two assets is calculated by multiplying the standard deviation of one stocks returns by the standard deviation of another stocks returns by the correlation coefficient (that is, the correlation between the two sets of returns). In this formula, the correlation coefficient (for assets i and j) is represented by  ij  . While this symbol looks like the letter  p it is actually the lower case Greek letter  rho. You should know that many professors and textbooks substitute an  r in place of  rho when presenting the formula for covariance. In that case, the correlation between assets  i and  j would be denoted as  rij . The standard deviation symbol is represented by the lower case Greek letter  sigma. So,  i represents the standard deviation of security  i and  j represents the standard deviation of security j. Standard deviation of a two-asset portfolio  EMBED Equation.3  This is one of the more complicated-looking formulas that you will work with for the exam. But, remember that the formula is provided so you only need to know which information to plug into the formula and then understand the concepts and implications. The weights (that is, percentage of your money invested in each asset) must add to 100 percent. Since this is for a two-asset portfolio (asset i and asset j), then Wi is the percent of money invested in asset i and Wj is the percent of your money invested in asset j. Remember that standard deviation is denoted by the Greek letter . Therefore, the standard deviation of the portfolio is p, the standard deviation of asset i is i and the standard deviation of asset j is j. COVij is the covariance of asset i and asset j. Remember that since the formula for covariance is ijij then you could substitute this term into the formula for the portfolio standard deviation and it becomes:  EMBED Equation.3  Beta  EMBED Equation.3  Beta is a measure of an assets systematic risk. There are other similar terms for this type of risk. In fact, it is also correct to say: beta measures an assets nondiversifiable risk; and beta measures an assets market risk. This formula shows that an assets beta can be calculated by dividing the covariance (between an assets return and the market return) by the variance of the market returns (remember that variance is denoted by 2, which is the standard deviation squared). This formula simplifies to:  EMBED Equation.3  Standard deviation of historical returns (population)  EMBED Equation.3  This formula is used to determine the population standard deviation of a set of stock returns. In this equation, the standard deviation of returns is denoted by r. This formula directs us to take each return that occurred in a past period (rt) and subtract from that return the arithmetic average return ( EMBED Equation.3 ). We then square that difference. Next, we add together all of the squared differences (the  in the equation means to  sum ). We divide this amount by the total number of returns that we used. This gives us the variance of the population (which, by the way is denoted as 2). When we take the square root of the variance we get the standard deviation. Standard deviation of historical returns (sample)  EMBED Equation.3  This formula is used to determine the sample standard deviation of a set of stock returns. In this equation, the standard deviation of the sample is denoted by sr. As you can see, this formula is very similar to the formula used to calculate the standard deviation of a population. The only difference is in the denominator. This formula directs us to take each return that occurred in a past period (rt) and subtract from that return the arithmetic average return ( EMBED Equation.3 ). We then square that difference. Next, we add together all of the squared differences. We divide this amount by the total number of returns that we used, minus one. This gives us the variance of the sample. When we take the square root of the variance we get the standard deviation. Conversion value of a convertible bond  EMBED Equation.3  Some bonds contain an option that allows the bond holder to convert the bond into a fixed number of shares of common stock. This formula is used to determine the conversion value (CV), should a bond holder elect to exercise the option. The bond indenture will specify the price at which the shares can be converted. This price is referred to as the conversion price and is represented by CP in the formula. If we divide the par value of the bond by the conversion price, we are able to determine the total number of shares (called the conversion ratio) that will be received upon conversion. When we multiply the number of shares we can receive by the current market price (Ps) of the firms common stock, we get the conversion value. For example, assume there is a $1,000 par value convertible bond. The conversion price is specified to be $40. The bond holder therefore has the option to convert the bond into 25 shares (the conversion ratio is $1,000 / $40). If the current market price of the common stock is $42.50 per share, then the conversion value is equal to $1,062.52 (calculated as follows: 25 shares times $42.40 per share). Capital asset pricing model (also the security market line)  EMBED Equation.3  This is one of the more important concepts in the investment material. The capital asset pricing model (CAPM) is used to determine the required rate of return on an asset, given its level of systematic risk. In this formula, the required rate of return on a risky asset is equal to the risk free rate (rf) plus a risk premium (represented by ( rm rf )i in the equation) to compensate the investor for taking on market risk. The risk premium for the particular asset is determined by multiplying the market risk premium (which is ( rm  rf ) in the equation) by the asset s beta coefficient (i ). Now, this is another one of the formulas in which the notations for some of the variables are sometimes inconsistent. It is common to see the  r replaced with a  k. Sometimes the beta () is denoted simply with a  b. So, the formula could take many forms including:  EMBED Equation.3  The formula for the capital asset pricing model is actually the equation of a line. When CAPM is graphed, the line is called the security market line (SML). The SML shows the relationship between an assets systematic risk and the required rate of return. Assets with greater risk are expected to provide higher rates of return. The graph takes the following form:  Capital market line  EMBED Equation.3  The formula for the capital market line (CML) is quite similar to the formula for the security market line (SML). The main differences between the two models are: 1) the CML is used to express the risk and return relationship for diversified portfolios only, whereas the SML can be used to show the relationship between risk and return for any asset; and 2) the CML uses standard deviation as the risk measure, whereas the SML uses beta. In the formula, the required rate of return for the portfolio (rp) is equal to the risk free rate of return plus a portfolio risk premium. The risk premium for the portfolio is equal to the market risk premium (the term in brackets) multiplied by the standard deviation for the portfolio. Note that the term in brackets is simply the excess market return divided by the standard deviation for the market. This excess market return per unit of market risk is multiplied by the risk of the portfolio. This determines the risk premium that investors require before investing in this portfolio. The graph showing the CML is as follows:  Sharpe ratio  EMBED Equation.3  The Sharpe ratio is a risk-adjusted measure of portfolio performance. In the formula, the portfolio return is denoted by rp. The risk free rate is denoted by rf. In the numerator of the equation you have the excess return. That is, it is the return that the portfolio earned that is in excess of the risk free rate of return. A portfolio manager certainly hopes that the numerator is positive. Otherwise, the portfolio (composed of risky assets) earned less than could have been earned if the funds had been invested in risk free Treasury securities. The excess return is then divided by the standard deviation of the portfolio (p). This ratio gives the excess portfolio return per unit of total risk. You should remember that the Sharpe ratio is a relative measure of performance. This means that the value of the ratio is difficult to interpret on its own. It must be compared to another Sharpe ratio. Consider the following example. Assume that ABC Value Portfolio earned an 11.65 percent return last period. The risk free rate during the same time period was 5.25 percent. The standard deviation of the portfolio was 12 percent. The return on the S&P 500 was 12.0 percent and the standard deviation for the S&P 500 was 15.3 percent. The Sharpe ratio for the ABC Value Portfolio (Sp) and the Sharpe ratio for the S&P 500 (Sm) are computed as follows:  EMBED Equation.3   EMBED Equation.3  We can conclude that the ABC Value Portfolio outperformed the market (S&P 500) on a risk-adjusted basis. Alpha (Jensens Alpha)  EMBED Equation.3  Jensens alpha is an absolute measure of performance. In essence, the value of alpha indicates the value added to (or subtracted from) the portfolio as a result of portfolio management. Alpha is denoted by the Greek letter alpha () although sometimes you see it simply as a lowercase  a . The formula shows that the alpha of the portfolio p is equal to the actual portfolio return  rp minus the following term: [rf + (rm  rf)p]. You should recognize the term in brackets: it is the capital asset pricing model that is used to produce the required rate of return for an asset. So, the alpha of the portfolio is simply the actual portfolio return minus the return that the investor expected to earn when they invested in the asset. Consider the previous example. Assume that ABC Value Portfolio earned an 11.65 percent return last period. The risk free rate during the same time period was 5.25 percent. ABC Value Portfolio has a beta of .80. The return on the S&P 500 was 12.0 percent. The alpha for the ABC Value Portfolio is computed as follows:  EMBED Equation.3  We can conclude that the ABC Value Portfolio outperformed expectations by one percent on a risk-adjusted basis. Treynor Ratio  EMBED Equation.3  The Treynor ratio is also a risk-adjusted measure of portfolio performance. As with the Sharpe ratio, the portfolio return is denoted by rp and the risk free rate is denoted by rf. The excess portfolio return is again expressed in the numerator of the equation (remember this is the return that the portfolio earned that is in excess of the risk free rate of return). The excess return is then divided by the beta of the portfolio (p). This ratio gives the excess portfolio return per unit of systematic risk. The Treynor ratio (like the Sharpe ratio) is a relative measure of performance. This means that the value of the Treynor ratio is difficult to interpret on its own. It must be compared to another Treynor ratio to assess performance. Consider the previous example. Assume that ABC Value Portfolio earned an 11.65 percent return last period. The risk free rate during the same time period was 5.25 percent. ABC Value Portfolio has a beta of .80. The return on the S&P 500 was 12.0 percent. The Treynor ratios for the ABC Value Portfolio and for the S&P 500 are computed as follows:  EMBED Equation.3   EMBED Equation.3  We know that both the Treynor ratio and the Jensen measure (alpha) use beta to assess risk. Remember that beta is one of the statistics produced in a statistical regression (when portfolio returns are regressed against market returns). Another important statistic from the same regression is r2 (the coefficient of determination). In a way, the coefficient of determination tells us how good our regression is. If the regression produces a high value of r2 then this means that the regression is good and the statistics it produced (including beta) are good. If the regression produces a low value of r2 then the regression is not good and the resulting statistics (including beta) are not reliable. In this case, you should not use Treynor or Jensen (alpha) to evaluate portfolio performance because both of these measures use beta to assess portfolio risk. 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Since Sharpe uses standard deviation, it is not influenced by the regression statistics. Bond Duration  EMBED Equation.3  There are two advantages of this formula. One, it highlights the fact that duration is, by definition, a time weighted payback. The denominator of the formula is the bond price. The numerator of the formula includes each future cash flow multiplied by the year in which it occurs. So, the formula shows us that the duration of a bond is a time-weighted payback with the each future cash flow weighted by the year in which it occurs. Ct is the cash flow that occurs in period t. The total number of periods is denoted by n. The yield to maturity for this bond is denoted by i. However, the real value of this formula is that it helps us appreciate the next formula, which is much, much more simple and the recommended approach to solve for bond duration. I do not believe that you should use this formula to solve for bond duration, under any circumstance. Bond Duration  EMBED Equation.3  While this is a scary looking formula, it is really not that bad. Keep in mind that it will be provided on the CFP exam, so dont try to memorize it. Just be able to plug in the appropriate variables, and then carefully perform the mathematics. The three variables represented in this formula are: C = coupon rate Y = yield to maturity T = time to maturity Coupon rate will be entered as a decimal. For a bond with a 6 percent coupon rate, you will enter .06 in the formula. Yield will also be entered as a decimal. If this bond is currently priced to yield 6.5 percent, you will enter .065 in the formula. Time to maturity is entered as a whole number. If there are 13 years remaining until the bond matures, then you will enter 13 in the formula. For example:  EMBED Equation.3  Estimating a price change (using duration)  EMBED Equation.3  In this formula,  P represents  price. The Greek letter delta () means  change. Therefore, P means the change in price. If you divide P by price, this gives you the percentage price change. As we know, the price of a bond changes in response to changes in interest rates. We also know that bond duration is a measure of a bonds price sensitivity to interest rate changes. This formula can be used to estimate the percentage that a bonds price will change when interest rates change. In the formula, D is the bond s duration. The market interest rate, or yield, is denoted by  y. In the numerator of the ratio we have y which is the change in yield. The denominator is simply one plus the yield (1+y). Assume that a bond has a duration equal to 8 years. Further assume that the market rate of interest is 5 percent (0.05). If the interest rate increases to 6 percent (0.06) then the change in market yield (y) is 0.01. 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