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Step-Deviation Method for Variance
Let:
$$u_i=\frac{x_i-A}{h}$$
Then:
$$\sigma^2=h^2\left[\frac{\sum f_iu_i^2}{N}-\left(\frac{\sum f_iu_i}{N}\right)^2\right]$$
Usage
- Used for grouped data with equal class intervals.
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Step-Deviation Method for Variance
Let:
$$u_i=\frac{x_i-A}{h}$$
Then:
$$\sigma^2=h^2\left[\frac{\sum f_iu_i^2}{N}-\left(\frac{\sum f_iu_i}{N}\right)^2\right]$$
Usage
- Used for grouped data with equal class intervals.
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