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Topic: Re: Two-samples difference: semi-amplitude vs. sizes
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Luis A. Afonso

Posts: 4,758
From: LIsbon (Portugal)
Registered: 2/16/05
Re: Two-samples difference: semi-amplitude vs. sizes
Posted: Oct 2, 2013 4:42 PM
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____1. The total sum of squared deviations, ssd= ssdX + ssdY, does follow a Chi squared n-2 df. (n=nX+nY)
It is true only when sigma=1: otherwise we must multiply the semi-amplitude by sigma.
This follows from :
_____(n-1)*s^s/variance = 1/(s^2)* sum (X_i - xhat)^2
follows a chi-squared n-1 df.
Luis A. Afonso

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