Measures of dispersion

6 important questions on Measures of dispersion

What is the formula of deviance?

Deviance = Xi (value of individual) - Xm (mean)

What is the formula of total deviance?

Sum of all deviances

What is the problem of total deviance?

The total deviance is always zero (negative and positive deviations) - not a useful measure of spread
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What is the sum of squared errors?

Two steps:
1. Square the deviances (i.e. Errors)
2. Add the squared deviances

What is the formula for variance?

The sum of squared errors divided by number of observations minus 1

What does a larger standard deviation mean?

Bigger spread/dispersion around the mean

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