FIN 360: Corporate Finance

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Presentation transcript:

FIN 360: Corporate Finance Topic 7: Risk and Rates of Return I (and Statistics Review) Larry Schrenk, Instructor

Outline Probability Measures The Histogram Linear Regression What is Risk? Three Stage Analysis of Risk Two Classes of Risk

1. Probability Measures

Probability Measures Measures of Central Tendency Mean, Median, Mode Measures of Dispersion Standard Deviation, Variance Higher Moments Skewness, Kurtosis Measures of Dependence Covariance, Correlation

Measures of Central Tendency What is a Measure of Central Tendency?

Mean (Average) Equal Weighted Average (m, ) Applications Calculation:

Mean (Average) Calculating the Equally Weighted Average

Mean (Average) (Unequally) Weighted Average Applications Calculation:

Mean (Average) Calculating the Unequally Weighted Average

Mode The mode is the most frequent number. 2, 3, 4, 2, 5, 7, 8, 2, 3

Median The median is the ‘middle’ number. 2, 3, 4, 2, 5, 7, 8, 2, 3 Ordered: 2, 2, 2, 3, 3, 4, 5, 7, 8 The median is 3.

Measures of Dispersion What is a Measure of Dispersion?

Variance Variance (s2) Applications Calculation: Sample versus Population

Variance Calculating Variance

Standard Deviation Standard Deviation (s)

Standard Deviation Calculating Standard Deviation

Calculators On the exams you may use the statistical functions on your calculator (or the formulae) to calculate these probability measures.

Higher Moments What is a Higher Moment?

Normal Distribution has a skewness of 0, i.e., it is symmetric

Normal Distribution has a kurtosis of 3

Measures of Dependence What is a Measure of Dependence?

Covariance Covariance (sX,Y) Applications Calculation: Variance versus Covariance

Covariance Calculating Covariance Note: Unit Dependence

Correlation Correlation (rX,Y) Applications Calculation: Range: -1 < r <1

Correlation Calculating Correlation

T-P-S What is the correlation? 0.5 1 None of the above

2. The Histogram

The Histogram Histogram Ordered, column graph of data 25, 73, 59, 32, 65, 71, 13, 2, 93, 32, 74, 42, 95, 61, 33, 28, 28, 56, 22, 43, 48, 67, 69, 82, 13, 48, 46, 19, 70, 8, 27, 39, 71, 80, 32, 79, 77, 41, 99, 82, 57, 22, 84, 50, 93, 6, 26, 20, 86, 79 Histogram

The Histogram Construction Excel Function Available Order the numbers Groups into ranges (bins) Plot on a column graph Excel Function Available

The Histogram EXAMPLE Set: Order the numbers Groups into ranges (bins) 2, 4, 5, 2, 3, 4, 5, 6, 7, 8, 6, 8, 6, 7, 5, 3, 4, 5, 7, 8 Order the numbers 2, 2, 3, 3, 4, 4, 4, 5, 5, 5, 5, 6, 6, 6, 7, 7, 7, 8, 8, 8 Groups into ranges (bins)

The Histogram Plot on a column graph

The Histogram Histogram represents sample. Estimate the population with closest, common continuous distribution. ‘Goodness-of-Fit’ software.

3. Linear Regression

The Method of Linear Regression Best Linear Fit BLUE ‘Least Squares’ Criterion Dependent versus Independent Variable Example: Education versus Income Excel Function Available Covered in a later topic

The Method of Linear Regression Data

The Method of Linear Regression Scatter Plot of Data

The Method of Linear Regression Fitting the Best Line

Optimization Minimize the sum of squared differences from the mean

The Method of Linear Regression Results Intercept = 3.3 Slope = 0.98 R2 = 0.32 Standard Error = 3.5 Interpretation

Two Applications of Statistical Techniques to Financial Data Are Assets Normally Distributed? Skewness Leptokurtic Tails Value-at-Risk Regression and b Getting b from a Linear Regression Capital Asset Pricing Model (CAPM)

Anscombe’s Quartet

Anscombe’s Quartet

Anscombe’s Quartet

Anscombe’s Quartet I

Anscombe’s Quartet II

Anscombe’s Quartet III

Anscombe’s Quartet IV

Always Plot Your Data First Moral of the Story Always Plot Your Data First

4. What is Risk?

Risk and Uncertainty In every facet of our lives we face something unknown. Complete lack of knowledge is ‘ignorance’. Some idea of its probability is ‘risk’.

Risk and Ignorance Ignorance Risk If you ask me to put my hand in a box and pull out a mystery object, this is Ignorance, since I have no idea what the box may contain. Risk If you ask me to put my hand in a box containing an equal number of red and blue balls and ask me to pull out a ball, this is risk I may not know which color I will get, but I know that the probability is 50-50 for each color. Risk  Rational Expectation

The Quantification of Risk Past Data Historical prices Forward-looking data Assumption: Future behaves like past Statistical Distribution Distribution, Mean, Variance, etc.

Quantification Example Historical Data: Normally distributed, m = 10%, s = 20% Forecast E[r] = 10% Confidence intervals, standard error, etc.

‘Expected’ versus ‘Realized’ Forecast is only expectation E[ ] = Expectations Operator Contrast: realized/actual value Quantify the forecast error confidence intervals Note: In cases of ignorance, I could not even form such an expectation.

What is Risk Risk: The possibility the realized value will differ from the expected value. Risk free asset  realized = expected Greater risk  greater likelihood that the realized value will differ from the expected value.

Downside versus Upside Risk Realized value higher or lower than expected Upside Risk: Better possibility Actual stock return higher than expected Downside Risk: Worse possibility Actual stock return lower than expected NOTE: Alternate definition–risk as only downside risk

5. Three Step Analysis of Risk

Three Step Analysis of Risk Identify Risk Measure Risk Price Risk

Step 1–Identify Risk Identify risk exposure Profit of a firm Input price changes Labor problems Shifts in consumer tastes Bond Interest rate risk Default risk Foreign investment Exchange rate risk Result: Asset exposed to risks X, Y, etc.

Step 2–Measure Risk Measure/quantify the risk ‘Cardinal Ordering’ Use of statistics Historical volatility/standard deviation Correct measure of specific risks Result: Asset exposure to risk X is 8 units.

Step 3–Price Risk Price the Risk Compensation for specific level of risk. Return, not dollar, compensation Higher risk  higher return Result: Asset exposure to 8 units of X risk yields a risk premium of 10%. Recall: Risk premium = E[r] – rf

Over-Simplified Example Risk Exposure: Return Volatility Risk Measure: Standard Deviation Risk Price: 1% risk premium per 2% Standard Deviation

Which is Riskier?

Which is Riskier? (cont’d) Expected Return Investment A = 10% Investment B = 10% Which is riskier? Which is more likely to differ from the expected value? Which is more likely to actually have a return of about 10%?

? Selecting Stocks Which stock would you choose from each pair?▪ R s A 10% 20% B 12% 15% R s E 10% 15% F 12% R s C 11% 12% D 10% 15% R s G 10% 12% H 15% ?

Dominance Basic Assumptions–Risk-Return Trade-Off Like Return Dislike Risk Dominance  Universal Choice B dominates A C dominates D F dominates E No dominance between G and H Dominance versus Taste Preference

Dominance Graph Which stocks are dominated?▪ A Return B C D E F s

Risk Analysis: Recap Risk Exposure: Return Volatility Risk Measure: Standard Deviation Risk Price: ???

6. Two Classes of Risk

Two Classes of Risk Thousands of possible risks Two basic classes: Non-Market Risk Market Risk Note: We will discuss the appropriateness of these names shortly.

Non-Market Risk Has an effect on… Examples: One firm, Selection of firms, or Maybe even an industry, but Not the market as a whole. Examples: A Labor Problem Change in an Input Price Litigation Etc.

Market Risk Has an effect on… Examples: Market as a whole Economy-wide Interest Rate Changes A Change in the Corporate Tax Rate Inflation Etc.

Alternate Names Non-Market risk is also called: Microeconomic Risk Idiosyncratic Risk Firm/Company Specific Risk Diversifiable Risk Non-Systematic Risk Market risk is also called: Macroeconomic Risk Non-Diversifiable Risk Systematic Risk

Market–Non-Market Continuum Where do the following risks fall?▪ Warehouse fire Change in Social Security tax Strike in auto industry Bug found in Windows Change in foreign exchange rate Inflation expectations Swine flu ▪

T-P-S Inflation, recession, and high interest rates are economic events that are best characterized as being systematic risk factors that can be diversified away. company-specific risk factors that can be diversified away. among the factors that are responsible for market risk. risks that are beyond the control of investors and thus should not be considered by security analysts or portfolio managers. irrelevant except to governmental authorities like the Federal Reserve.