15.433 INVESTMENTS Class 2: Securities, Random Walk on ...
15.433 INVESTMENTS Class 2:
Securities, Random Walk on Wall Street
Reto R. Gallati MIT Sloan School of Management
Spring 2003 February 5th 2003
Probability Theory
Outline
? A brief review of probability distributions ? Evaluating random events with normals. ? Large surprises and normal distributions.
Statistical Data Analysis
? Empirical distributions. Sample statistics. ? The precision of sample statistics.
Summary Questions for Next Class
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What makes an event random
? Flipping a Coin:
? Forecasting tomorrow's temperature
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Probability Distributions
Mathematical tools for random events. It has two components: outcomes and their likelihood.
Examples:
? Binomial Distribution 0 with probability p
X= 1 with probability 1-p
? Standard Normal Distribution
Figure 1: Normal distribution, Source: RiskM etricsT M - Technical Document, p. 69.
1 standard deviation 68.26% probability 2 standard deviations 95.54% probability 3 standard deviations 99.74% probability
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Figure 2: Normal distribution, Source:
CreditM etricsT M -Technical Document, p. 70.
Figure 3: Normal distribution, Source: CreditM etricsT M -Technical Document, p. 37.
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