Variance and Standard Deviation for Conditional and Marginal Distributions
Free SOA Exam P (Probability) lesson in Multivariate Random Variables. 18 min read, ~2,704 words.
Eve's law:, within-group plus between-group. Conditional variance uses the conditional PMF and measures within-group spread, generally varying with. Variances add, SDs do NOT: always decompose variances, then take the square root only at the end. If all conditional means equal: the between-group term vanishes. If all conditional variances zero: the...
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What this lesson covers
- Content
- Example 1
- Example 2
- Example 3
- Common Mistakes
- Check Your Understanding
- Exam Shortcuts
Learning objectives
- 3d
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