Quantitative Methods Flashcards
Compound Interest
Interest on interest. Growth in the value of the investment from period to period reflects not only interest earned on the original principal amount, but also on the interest earned on the previous period’s interest earnings
Future Value
Projecting the cash flows forward, on the basis of an appropriate compound interest rate (compounding). Amount a current deposit will grow over time when placed in an account paying compound interest
FV = PV(1+1/Y)^N
Present Value
Brings the cash flows from an investment back to the beginning of an investment’s life based on the appropriate compound interest rate (discounting). Today’s value of of cash that is to be received some point in the future. Amount of money that must be invested today, at a given rate of return over a period of time, in order to end up with a specified FV
Equilibrium Interest Rates
Required rate of return for a particular investment
Market Rate of Return
Return that investors and savers require to get them to willingly lend their funds
Discount Rates
Interest rates. If you can borrow at 10%, discount payments to be made in the future at that rate in order to get equivalent value in dollars
Opportunity Cost of Current Consumption
Earning an additional interest in excess of the interest rate is the opportunity foregone when current consumption is chosen rather than saving (postponing consumption)
Real Risk Free Rate
Theoretical rate on a single-period loan that has no expectation of inflation in it. An investor’s increase in purchasing power after adjusting for inflation
Risk Free Rates
T-bills: since expected inflation in future periods is not zero
Nominal Risk Free Rates
Contain an inflation premium: nominal risk free rate = real risk free rate + expected inflation rate
Default Risk
Risk that a borrower will not make the promised payments in a timely manner
Liquidity Risk
Risk of receiving less than fair value for an investment if it must be sold for cash quickly
Maturity Risk
Prices of longer term bonds are more volatile than those of shorter term bonds (more maturity risk)
Required Interest Rate
= nominal risk free rate + default risk premium + liquidity premium + maturity risk premium
Effective Annual Rate (EAR)
Rate of interest actually realize as a result of compounding. Annual rate of return actually being earned after adjustments have been made for different compounding periods
(1 + periodic rate)^m - 1 where periodic rate = stated annual rate/m and m = number of compounding periods
Future Value Factor
(1+I/Y)^N represents compounding rate on an investment
Annuity
Stream of equal cash flows that occurs at equal intervals over a given period
Ordinary Annuity
Cash flows that occur at the end of each compounding period
Annuity Due
Payments or receipts occur at the beginning of each period
Perpetuity
Pays a fixed amount of money at set intervals over an infinite period of time (preferred stock)
PV of a Perpetuity
Fixed periodic cash flow divided by the appropriate periodic rate of return
Cash Flow Additivity Principle
Present value of any stream of cash flows equals the sum of the present values of the cash flows
Net Present Value
Present value of expected cash inflows associated with the project less the present value of the project’s expected cash outflows, discounted at the appropriate cost of capital
Internal Rate of Return
Rate of return that equates the PV of an investment’s expected benefits with the PV of its costs. Discount rate for which the NPV of an investment is zero
NPV Decision Rule
If a project has positive NPV, the amount goes to the firm’s shareholders. When two projects with positive NPV are mutually exclusive, choose the one with the higher positive NPV
IRR Decision Rule
Accept projects with an IRR greater than the firm’s required rate of return
Holding Period Return
The percentage change in the value of an investment over the period it is held
Total Return
Assets with cash flows such as dividend or interest payments, added to interim cash flows, have total return
Money Weighted Return
Internal rate of return on a portfolio, taking into account all cash inflows and outflows.
Time Weighted Rate of Return
Measures compound growth. Rate at which $1 compounds over a specified performance horizon. Averaging a set of values over time
Bank Discount Yield
Quotes for T-bills, based on the face value of the instrument instead of the purchase price. Not representative of return earned by an investor
Holding Period Yield
Total return an investor earns between the purchase date and the sale or maturity date. Actual return an investor will receive if the money market instrument is held until maturity
Effective Annual Yield
Annualized value, based on 365 day year, that accounts for compound interest. Annualized HPY on basis of 365 day year that incorporates annual compounding
Money Market Yield
Annualized holding period yield, assuming a 360 day year. Makes quote yield on the t-bill comparable to yield quotes for interest bearing money market instruments
Bond Equivalent Yield
2 x the semiannual discount rate
Descriptive Statistics
Summarize important characteristics of large data sets
Inferential Statistics
Procedures used to make forecasts, estimates, or judgments about a large set of data based on the statistical characteristics of a smaller set
Population
Set of all possible members of a stated group
Sample
Subset of the population of interest. Can be used to describe the population as a whole (N)
Nominal Scales
Level of measurement that contains the least information. Observations classified or counted with no particular order (n)
Ordinal Scales
Every observation is assigned to one of several categories. Then the categories are ordered with respect to a specified characteristic
Interval Scale
Provide relative ranking, plus the assurance that differences between scale values are equal. A measurement of zero does not necessarily indicate the total absence of what we are measuring
Ratio Scales
Most refined level. Provide ranking and equal differences between scale values, and they have a true zero point as the origin
Parameter
Measure used to describe a characteristic of a population
Sample Statistic
Used to measure a characteristic of a sample
Frequency Distribution
Tabular presentation of statistical data that aids the analysis of large data sets. Summarize statistical data by assigning it to specified groups or intervals
Interval
Class. The set of values that an observation may take on
Absolute Frequency
Actual number of observations that fall within a given interval
Modal Interval
In frequency distribution, the interval with the greatest frequency
Relative Frequency
Divide the absolute frequency of each return interval by the total number of observations (percentage of total observations falling within each interval)
Cumulative Absolute Frequency
Sum of the absolute frequencies starting at the lowest interval and progressing through the highest. Sum of the absolute frequencies up to and including the given interval
Cumulative Relative Frequency
Sum of the relative frequencies starting at the lowest interval and progressing through the highest. Sum of the relative frequencies up to and including the given interval
Histogram
Graphical presentation of the absolute frequency distribution. Bar chart of continuous data that has been classified into a frequency distribution (chosen intervals on horizontal axis, absolute frequencies on vertical)
Frequency Polygon
The midpoint of each interval is plotted on the horizontal axis, and the absolute frequency for that interval is plotted on the vertical axis. Each point is connected with a straight line
Measures of Central Tendency
Identify the center, or average, of a data set (typical or expected value)
Population Mean
All the observed values in the population are summed and divided by the number of observations in the population
Sample Mean
Sum of all the values in a sample of a population, divided by the number of observations in the sample. Used to make inferences about the population mean
Arithmetic Means
Sum of the observation values divided by the number of observations. All interval and ratio data sets have one, all data values are considered and included, a data set only has one, sum of deviations from the mean is zero
Weighted Mean
Different observations may have a disproportionate influence on the mean
Median
Midpoint of a data set when the data is arranged in ascending or descending order. Not affected by extreme values
Mode
Value that occurs the most frequently in a data set. May have more than one or none (unimodial, bimodial, trimodial)
Geometric Mean
Often used when calculating investment returns over multiple periods or when measuring compound growth rates. Only has a solution if product under radical is positive. Always less than or equal to arithmetic mean (can only be equal when observations are all equal)
Harmonic Mean
Average cost per shares purchased over time (will be less than geometric mean)
Quantile
Measures of location. Value at or below which a stated proportion of the data in a distribution lies (quartile = quarters, quintile = fifths, decile = tenths, percentile = hundredths)
Dispersion
Variability around the central tendency
Range
Distance between the largest and smallest value in the data set
Mean Absolute Deviation (MAD)
Average of the absolute values of the deviations of the individual observations from the arithmetic mean)
Population Variance
Average of the squared deviations from the mean
Biased Estimator
Systematically underestimating the population parameter, specifically for small samples (that’s why n-1 is used)
Chebyshev’s Inequality
For any set of observations, whether sample or population data and regardless of shape of distribution, the percentage of observations that lie within k standard deviations of the mean is at least 1 - 1/k^2 for all k > 1 (minimum percentage of any distribution that lies within a given standard deviation)
Relative Dispersion
The amount of variability in a distribution relative to a reference point or benchmark
Coefficient of Variation
Measures the amount of dispersion in a distribution relative to the distribution’s mean. Can make a direct comparison of dispersion across different sets of data (measure risk per unit of expected return)
Sharpe Ratio
Measures excess return per unit of risk (reward to variability ratio)
Symmetrical Distribution
Shaped identically on both sides of the mean, intervals of losses and gains will exhibit the same frequency (mean, median and mode are equal)
Skewness
Extent to which a distribution is not symmetrical (outliers in a data set)
Outliers
Observations with extraordinarily large values, either positive or negative
Positively Skewed
Many outliers in the upper region, or right tail
(mode < media < mean) - mean is most affected by outliers
Negatively Skewed
Disproportionately large amount of outliers that fall within its lower (left) tail
(mean < median < mode)
Kurtosis
Measure of the degree to which a distribution is more or less “peaked” than a normal distribution
Leptokurtic
More peaked than a normal distribution (more returns clustered around the mean and more returns with large deviations from the mean –> fatter tails). Greater percentage of small deviations from the mean and extremely large deviations from the mean (greater likelihood of increased risk)
Platykurtic
Less peaked (flatter) than a normal distribution
Mesokurtic
Same kurtosis as a normal distribution
Excess Kurtosis
Either more or less kurtosis than the normal distribution (normal kurtosis is 3, excess is 0)
Sample Skewness
Sum of the cubed deviations from the mean divided by the cubed standard deviation and by the number of observations
Random Variable
Uncertain quantity/number
Outcome
Observed value of a random variable
Event
Single outcome or set of outcomes
Mutually Exclusive
Events that cannot both happen at the same time
Exhaustive Events
Include all possible outcomes
Empirical Probability
Established by analyzing past data (objective)
A priori Probability
Determined using a formal reasoning and inspection process (objective)
Subjective Probability
Least formal method of developing probabilities, involves use of personal judgment
Unconditional Probability
Marginal probability. Probability of an event regardless of the past or future occurrence of other events