Berton Gunter wrote:
Quite right, John!
I have 2 additional questions:
1) Why test for normality of residuals? Suppose you reject -- then what?
(residual plots may give information on skewness, multi-modality, data
"anomalies" that can affect the data analysis).
Because I want to know if my model satisfies the basic assumptions of
regression theory... in other words I want to know if I can "trust" my
model.
Cheers,
Federico
2) Why test for normality? Is it EVER useful? Suppose you reject -- then
what?
(I am tempted to add a 3rd question -- why test at all? -- but that is
perhaps too iconoclastic and certainly off topic. Let the hounds remain
leashed for now.)
Cheers,
-- Bert Gunter
Genentech Non-Clinical Statistics
South San Francisco, CA
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