Monday, 1 June 2015

Capital Asset Pricing Model (CAPM)
1.0 Introduction
The effects of risk and uncertainty upon asset prices, upon rational decision rules for individuals and institutions to use in selecting security portfolios, and upon the proper selection of projects to include in corporate capital budgets, have increasingly engaged the attention of professional economists and other students of the capital markets and of business finance in recent years (Lintner, 1965). The stock market is an extremely complex system with various interacting components (Sharma & Banerjee, 2015). One of the most important developments in modern capital theory is the capital asset pricing model (CAPM) developed by Sharpe (1964) and Lintner (1965) in (Wakyiku, 2010). The CAPM predicts that equilibrium prices will be set such that expected returns in excess of the riskfree rate will be proportional to the covariance with aggregate risk (Bossaerts & Plott, 2002). The Sharpe (1964) and Lintner (1965) capital asset pricing model (CAPM) is the workhorse of finance for estimating the cost of capital for project selection (Da, Guo, & Jagannathan, 2012). The CAPM is one the underlying building blocks of Modern Portfolio Theory and as such is constructed on a number of strong theoretical assumptions concerning the behaviour of financial markets and of investors (Boďa & Kanderová, 2014). Also called as the standard capital asset pricing model (CAPM), or the one-factor capital asset pricing model Sharpe–Lintner–Mossin form of a general equilibrium relationship in the capital markets (Elton, Gruber, Brown, & Goetzmann, 2014).

Research motivation
The overall result is a chaotic complex system which has so far proved very difficult to analyze and predict (Sharma & Banerjee, 2015). The movement of stock prices are somewhat interdependent as well as dependent on a wide multitude of external stimuli like announcement of government policies, change in interest rates, changes in political scenario, announcement of quarterly results by the listed companies and many others (Sharma & Banerjee, 2015).
Research objective
1. To determine the volatility of the market stock using simple CAPM.
2. Revisits empirical validity of the linear functional form of the CAPM with respect to recent data.
3. To determine the inefficiency of beta the measure of market risk
Implication of study
More better understanding in the volatility of the Malaysia market stock using random selected 10 stock index to represent each sector in the market. The revisit the validity of CAPM in Malaysia sector. The finding of this paper is the significant of beta imply the CAPM was hold but with low R-square show a the inefficiency of beta the measure of market risk (Wakyiku, 2010).











2.0 Literature review
The early researcher such as Sharpe and Cooper (1972) examined whether following alternative strategies, with respect to risk over long periods of time, would produce returns consistent with modern capital theory (Elton et al., 2014). The particular model consider is the Ross (1976) single-factor linear beta pricing model based on the stock index portfolio. We refer to this as the CAPM for convenience, following convention (Da et al., 2012).
Previous researcher like Wakyiku, (2010) refer to Lutwama (2006), Atuhairwe and Tarinyeba (2005), Katto and Tarinyeba (2004) and a few others, carry out non-econometric discussions of these issues. Meanwhile, Bossaerts & Plott, (2002) that prices do move towards the CAPM, but very slowly. This is because subjects generally have to trade combinations of securities in order to improve their positions, yet in thin markets, it is difficult to implement combined trades (Bossaerts & Plott, 2002).
Early empirical study of the CAPM performed by Lintner and reproduced in Douglas (1968) in (Elton et al., 2014). Lintner first estimated beta for each of the 301 common stocks in his sample. He estimated beta by regressing each stock’s yearly return against the average return for all stocks in the sample using data from 1954 to 1963 (Elton et al., 2014). Judd and Guu (2000) for theoretical evidence that the CAPM obtains when risk is small (Bossaerts & Plott, 2002).
Miller and Scholes (1972) in a classic article show that the anomalous results reported by Lintner may be an artifact of a number of statistical issues, most notably that the beta measured in the first-pass regression is only an estimate of the true beta (Elton et al., 2014). Hence, Welch (2008) finds that about 75.0% of finance professors recommend using the CAPM to estimate the cost of capital for capital budgeting. A survey of chief financial officers by Graham and Harvey (2001) indicates that 73.5% of the respondents use the CAPM (Da et al., 2012).

Fama and French (1993) conjecture that two additional risk factors beyond the stock market factor used in empirical implementations of the CAPM are necessary to fully characterize economy wide pervasive risk in stocks (Da et al., 2012). The positive value of the intercept that emerges is evidence in support of the two-factor model (Elton et al., 2014).
Fama and French (1992) come to similar conclusions using portfolios organized by size, book to market, as well as beta and conclude that the relation between beta and aver- age return is flat, even when beta is the only explanatory variable (Elton et al., 2014). Roll and Ross (1994) in Elton et al., (2014) argue that this is an artifact of using ordinary least squares in the cross-sectional second-pass regression. They argue that the relationship between average returns and beta is retrieved once heteroskedasticity and cross-sectional residual correlation is accounted for using generalized least squares instead of the more usual ordinary least squares in the second-pass cross-sectional regression











3.0 Method
By follow method use by Boďa & Kanderová, (2014), ten risky asset, stock, included in the KLSE index were selected to participate in the study in a random design. From each of the 10 different GICS sector represent in the KLSE index one stock was picked random so as to enable a variety of stocks stratified across various industries. The KLSE index is take as a proxy of the market portfolio, and the riskless rate is proxied by the nominal 3 month interest rate Malaysia government securities. The data was obtain using data stream from 2012 until 2015 with weekly frequency enable the 157 observation in the analysis.
GICS Sector                             Stock (& Ticker)
Consumer Discretionary UMW HOLDINGS (UMWH)
Consumer Staples BRIT.AMER.TOB.(MALAYSIA) (BAT)
Energy   PETRONAS DAGANGAN (PDAG)
Financials PUBLIC BANK (PBK)
Health Care BIOSIS GROUP (BISS)
GICS Sector                             Stock (& Ticker)
Industrials GAMUDA (GAM)
Information Technology MESINIAGA (MESI)
Materials PETRONAS CHEMICALS GP. (PCHEM)
Telecommunication Services      DIGI.COM (DIGI)
Utilities          YTL POWER INTERNATIONAL (YTLP)

Certain hypotheses can be formulated that should hold whether one believes in the simple CAPM or the two-factor general equilibrium model (Elton et al., 2014).
• The first is that higher risk (beta) should be associated with a higher level of return.
• The second is that return is linearly related to beta; that is, for every unit increase in beta, there is the same increase in return.
• The third is that there should be no added return for bearing nonmarket risk.



3.1 Model
Theoretical model
E (γi) = β E (γm)                                                                                                                      (1)
γi = Ri – Rf represents the return on risky asset i in excess of the riskless rate, and;
γm = Rm – Rf signifies the excess return on the market portfolio (often referred to as market premium or risk premium) (Boďa & Kanderová, 2014).
Econometric model
                                                                                                                   (2)
Where,
 Represents the return on risky asset i in excess of the riskless rate,
 The excess return on the market portfolio,
 Intercept,
 Slope,
 Error terms.







4.0 Result
A β of 1 indicates that the security’s price will move with the market. A β of less than 1 means that the security will be less volatile than the market (Sharma & Banerjee, 2015). A β of greater than 1 indicates that the security’s price will be more volatile than the market.
The estimated CAPM betas for individual stocks
GICS Sector                             Stock (& Ticker)
Consumer Discretionary UMW HOLDINGS (UMWH)
Consumer Staples BRIT.AMER.TOB.(MALAYSIA) (BAT)
Energy   PETRONAS DAGANGAN (PDAG)
Financials PUBLIC BANK (PBK)
Health Care BIOSIS GROUP (BISS)
BETA
1.14907
0.971523
0.883707
0.691022
-0.267932
GICS Sector                             Stock (& Ticker)
Industrials GAMUDA (GAM)
Information Technology MESINIAGA (MESI)
Materials PETRONAS CHEMICALS GP. (PCHEM)
Telecommunication Services      DIGI.COM (DIGI)
Utilities          YTL POWER INTERNATIONAL (YTLP)
BETA
1.141312
0.579111
1.106843
1.024636
1.124951

A β of greater than 1 indicates that the security’s price will be more volatile than the market. As an example, from table above we can see that the β of consumer discretionary sector is 1.14907 (15% more volatile than the market) while that of the financial sector is 0.691022 (30% less volatile than the market).
Heath care sector is -0.267932 indicates investment in the health sector tent to go down when market go up. Negative betas are possible for investments that tend to go down when the market goes up, and vice versa.

Stock beta estimates obtained using monthly stock returns
Stock name
Estimated beta
t-value
Standar error
R-squared
other factor
UMWH
1.14907
7.377338
0.155757
0.259879
74.01%
BAT
0.971523
5.234624
0.185596
0.150225
84.98%
PETD
0.883707
4.109046
0.215064
0.09823
90.18%
PBK
0.691022
6.637867
0.104103
0.221345
77.87%
BISS
-0.267932
-0.320462
0.836079
0.000662
99.93%
GAM
1.141312
7.459311
0.153005
0.264152
73.58%
MESI
0.579111
3.147779
0.183974
0.060085
93.99%
PCHEM
1.106843
8.893994
0.124448
0.337899
66.21%
DIGI
1.024636
7.965626
0.128632
0.290459
70.95%
YTLP
1.124951
6.421298
0.175191
0.210123
78.99%



The estimated beta coefficients range from 0.267932 to 1.14907. Nine out of the ten stocks’ beta coeffecients are positive and statistically significant at the 5% level. CAPM predicts that higher risk is associated with higher return, and therefore we expect positive beta estimates for CAPM to hold, and yet one stocks have beta coeffecients that are not statistically different from zero, even at the 10% level.
The R-squared values, as seen in table above, are also generally very low. It is NONE the stocks that have their variation in excess return fairly explained by the excess return on the market index. This is equivalent to having betas that are fairly inefficient in explaining the relation between market risk and return, for only three of the nine stocks with positive statistically significant beta. The R-squared value is the ratio of market risk to the sum of market and firm-specific risk, and as such a low value points to the inefficiency of beta the measure of market risk (Wakyiku, 2010).



5.0 Conclusion
The movement of stock prices are somewhat interdependent as well as dependent on a wide multitude of external stimulation like announcement of government policies, change in interest rates, changes in political scenario, announcement of quarterly results by the listed companies and many others (Sharma & Banerjee, 2015). The view that the CAPM provides a reasonable estimate of a project’s cost of capital, provided that any embedded real options associated with the project are evaluated separately for capital budgeting purposes. The CAPM beta enable the measure of exposure of the stock toward the risk.
The movement of stock prices are somewhat interdependent as well as dependent on a wide multitude of external stimuli like announcement of government policies, change in interest rates, changes in political scenario, announcement of quarterly results by the listed companies and many others (Sharma & Banerjee, 2015). The finding support the CAPM were the high risk imply with the high return does hold. The nine out of ten stock were significant which is support the previous study done by (Bossaerts & Plott, 2002) where positive value of the intercept that emerges is evidence in support of the two-factor model (Elton et al., 2014). However, the R-squared values are also generally very low. It is none the stocks that have their variation in excess return fairly explained by the excess return on the market index. This is equivalent to having betas that are fairly inefficient in explaining the relation between market risk and return, for only three of the nine stocks with positive statistically significant beta. The R-squared value is the ratio of market risk to the sum of market and firm-specific risk, and as such a low value points to the inefficiency of beta the measure of market risk (Wakyiku, 2010). We can suggest that the beta inefficient measure of market risk and the model such as FF 3 and 5 factor model (Fama & French, 2015) model are available to the future researcher.



Reference
Boďa, M., & Kanderová, M. (2014). Linearity of the Sharpe-Lintner version of the Capital Asset Pricing Model, 110, 1136–1147. doi:10.1016/j.sbspro.2013.12.960
Bossaerts, P., & Plott, C. (2002). The {CAPM} in Thin Experimental Markets. Journal of Economic Dynamics {&} Control, 26(7--8), 1093–1112.
Da, Z., Guo, R. J., & Jagannathan, R. (2012). CAPM for estimating the cost of equity capital: Interpreting the empirical evidence. Journal of Financial Economics, 103(1), 204–220. doi:10.1016/j.jfineco.2011.08.011
Elton, E. J., Gruber, M. J., Brown, S. J., & Goetzmann, W. N. (2014). MODERN PORTFOLIO THEORY AND INVESTMENT ANALYSIS (9th ed.).
Fama, E. F., & French, K. R. (2015). A five-factor asset pricing model $, 116, 1–22.
Lintner, J. (1965). The valuation of risk assets and the selection of risky investments in stock portfolios and capital budgets. The Review of Economics and Statistics, 47(1), 13–37. doi:10.2307/1924119
Sharma, C., & Banerjee, K. (2015). A Study of Correlations in the Stock Market, (April 2006), 1–12.
Wakyiku, D. (2010). Testing the Capital Asset Pricing Model (CAPM) on the Uganda Stock Exchange. arXiv Preprint arXiv:1101.0184, (1964). Retrieved from http://arxiv.org/abs/1101.0184








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APPENDIX

UMWH

Dependent Variable: UMWH


Method: Least Squares


Date: 05/31/15   Time: 02:46


Sample: 3/16/2012 3/13/2015


Included observations: 157












Variable
Coefficient
Std. Error
t-Statistic
Prob.  










FBMKLCI
1.149070
0.155757
7.377338
0.0000
C
0.002320
0.001811
1.280922
0.2021










R-squared
0.259879
    Mean dependent var
0.000313
Adjusted R-squared
0.255104
    S.D. dependent var
0.025992
S.E. of regression
0.022433
    Akaike info criterion
-4.743939
Sum squared resid
0.078000
    Schwarz criterion
-4.705006
Log likelihood
374.3992
    Hannan-Quinn criter.
-4.728127
F-statistic
54.42511
    Durbin-Watson stat
1.838461
Prob(F-statistic)
0.000000














BAT

Dependent Variable: BAT


Method: Least Squares


Date: 05/31/15   Time: 02:53


Sample: 3/16/2012 3/13/2015


Included observations: 157












Variable
Coefficient
Std. Error
t-Statistic
Prob.  










FBMKLCI
0.971523
0.185596
5.234624
0.0000
C
0.001189
0.002158
0.551083
0.5824










R-squared
0.150225
    Mean dependent var
-0.000508
Adjusted R-squared
0.144743
    S.D. dependent var
0.028904
S.E. of regression
0.026730
    Akaike info criterion
-4.393388
Sum squared resid
0.110748
    Schwarz criterion
-4.354455
Log likelihood
346.8810
    Hannan-Quinn criter.
-4.377576
F-statistic
27.40129
    Durbin-Watson stat
2.580097
Prob(F-statistic)
0.000001





















PETD

Dependent Variable: PETD


Method: Least Squares


Date: 05/31/15   Time: 02:54


Sample: 3/16/2012 3/13/2015


Included observations: 157












Variable
Coefficient
Std. Error
t-Statistic
Prob.  










FBMKLCI
0.883707
0.215064
4.109046
0.0001
C
-0.000464
0.002500
-0.185417
0.8531










R-squared
0.098230
    Mean dependent var
-0.002007
Adjusted R-squared
0.092413
    S.D. dependent var
0.032513
S.E. of regression
0.030974
    Akaike info criterion
-4.098660
Sum squared resid
0.148708
    Schwarz criterion
-4.059727
Log likelihood
323.7448
    Hannan-Quinn criter.
-4.082848
F-statistic
16.88426
    Durbin-Watson stat
2.199891
Prob(F-statistic)
0.000064














PBK


Dependent Variable: PBK


Method: Least Squares


Date: 05/31/15   Time: 03:00


Sample: 3/16/2012 3/13/2015


Included observations: 157












Variable
Coefficient
Std. Error
t-Statistic
Prob.  










FBMKLCI
0.691022
0.104103
6.637867
0.0000
C
0.000804
0.001210
0.664545
0.5073










R-squared
0.221345
    Mean dependent var
-0.000403
Adjusted R-squared
0.216322
    S.D. dependent var
0.016937
S.E. of regression
0.014993
    Akaike info criterion
-5.549767
Sum squared resid
0.034844
    Schwarz criterion
-5.510834
Log likelihood
437.6567
    Hannan-Quinn criter.
-5.533955
F-statistic
44.06128
    Durbin-Watson stat
2.466226
Prob(F-statistic)
0.000000



















BISS

Dependent Variable: BISS


Method: Least Squares


Date: 05/31/15   Time: 03:02


Sample: 3/16/2012 3/13/2015


Included observations: 157












Variable
Coefficient
Std. Error
t-Statistic
Prob.  










FBMKLCI
-0.267932
0.836079
-0.320462
0.7490
C
-0.001961
0.009720
-0.201732
0.8404










R-squared
0.000662
    Mean dependent var
-0.001493
Adjusted R-squared
-0.005785
    S.D. dependent var
0.120069
S.E. of regression
0.120415
    Akaike info criterion
-1.383082
Sum squared resid
2.247478
    Schwarz criterion
-1.344149
Log likelihood
110.5720
    Hannan-Quinn criter.
-1.367270
F-statistic
0.102696
    Durbin-Watson stat
2.406164
Prob(F-statistic)
0.749050
















GAM

Dependent Variable: GAM


Method: Least Squares


Date: 05/31/15   Time: 03:38


Sample: 3/16/2012 3/13/2015


Included observations: 157












Variable
Coefficient
Std. Error
t-Statistic
Prob.  










FBMKLCI
1.141312
0.153005
7.459311
0.0000
C
0.001900
0.001779
1.068259
0.2871










R-squared
0.264152
    Mean dependent var
-9.30E-05
Adjusted R-squared
0.259405
    S.D. dependent var
0.025606
S.E. of regression
0.022036
    Akaike info criterion
-4.779587
Sum squared resid
0.075268
    Schwarz criterion
-4.740654
Log likelihood
377.1976
    Hannan-Quinn criter.
-4.763775
F-statistic
55.64132
    Durbin-Watson stat
2.254536
Prob(F-statistic)
0.000000



















MESI

Dependent Variable: MESI


Method: Least Squares


Date: 05/31/15   Time: 03:40


Sample: 3/16/2012 3/13/2015


Included observations: 157












Variable
Coefficient
Std. Error
t-Statistic
Prob.  










FBMKLCI
0.579111
0.183974
3.147779
0.0020
C
-0.003794
0.002139
-1.773627
0.0781










R-squared
0.060085
    Mean dependent var
-0.004805
Adjusted R-squared
0.054021
    S.D. dependent var
0.027243
S.E. of regression
0.026497
    Akaike info criterion
-4.410935
Sum squared resid
0.108822
    Schwarz criterion
-4.372002
Log likelihood
348.2584
    Hannan-Quinn criter.
-4.395123
F-statistic
9.908514
    Durbin-Watson stat
2.371045
Prob(F-statistic)
0.001974














PCHEM

Dependent Variable: PCHEM


Method: Least Squares


Date: 05/31/15   Time: 03:41


Sample: 3/16/2012 3/13/2015


Included observations: 157












Variable
Coefficient
Std. Error
t-Statistic
Prob.  










FBMKLCI
1.106843
0.124448
8.893994
0.0000
C
-0.002331
0.001447
-1.611222
0.1092










R-squared
0.337899
    Mean dependent var
-0.004264
Adjusted R-squared
0.333627
    S.D. dependent var
0.021957
S.E. of regression
0.017924
    Akaike info criterion
-5.192747
Sum squared resid
0.049794
    Schwarz criterion
-5.153814
Log likelihood
409.6306
    Hannan-Quinn criter.
-5.176935
F-statistic
79.10313
    Durbin-Watson stat
2.337326
Prob(F-statistic)
0.000000




















DIGI

Dependent Variable: DIGI


Method: Least Squares


Date: 05/31/15   Time: 03:42


Sample: 3/16/2012 3/13/2015


Included observations: 157












Variable
Coefficient
Std. Error
t-Statistic
Prob.  










FBMKLCI
1.024636
0.128632
7.965626
0.0000
C
0.002222
0.001496
1.485782
0.1394










R-squared
0.290459
    Mean dependent var
0.000432
Adjusted R-squared
0.285882
    S.D. dependent var
0.021923
S.E. of regression
0.018526
    Akaike info criterion
-5.126615
Sum squared resid
0.053199
    Schwarz criterion
-5.087682
Log likelihood
404.4393
    Hannan-Quinn criter.
-5.110803
F-statistic
63.45119
    Durbin-Watson stat
1.895091
Prob(F-statistic)
0.000000
















YTLP

Dependent Variable: YTLP


Method: Least Squares


Date: 05/31/15   Time: 03:44


Sample: 3/16/2012 3/13/2015


Included observations: 157












Variable
Coefficient
Std. Error
t-Statistic
Prob.  










FBMKLCI
1.124951
0.175191
6.421298
0.0000
C
-0.001207
0.002037
-0.592715
0.5542










R-squared
0.210123
    Mean dependent var
-0.003172
Adjusted R-squared
0.205027
    S.D. dependent var
0.028299
S.E. of regression
0.025232
    Akaike info criterion
-4.508780
Sum squared resid
0.098678
    Schwarz criterion
-4.469847
Log likelihood
355.9392
    Hannan-Quinn criter.
-4.492968
F-statistic
41.23307
    Durbin-Watson stat
2.103193
Prob(F-statistic)
0.000000

















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