|
[Date Prev][Date Next][Thread Prev][Thread Next][Date index][Thread index]
st: Testing normality of a continuous predictor variable in a logistic model
From |
Brendan <[email protected]> |
To |
Stata List <[email protected]> |
Subject |
st: Testing normality of a continuous predictor variable in a logistic model |
Date |
Tue, 27 Nov 2007 13:04:49 +0200 |
I am working with a dataset containing 30000 observations. Some of
the explanatory variables are continuous. If I perform usual tests
for normality the numbers are too great for swilk or for sfrancia,
and if I use sktest the result is "absurdly" large values and rejects
the hypothesis of normal distribution. The frequency histogram,
cumulative frequency plot and normal plot all look normal with no
outliers. I presume that with such large numbers even very small
deviations from normal will lead to a significant result. The box-
tidwell test indicates that the model relationship is linear for all
these continuous variables. Is it safe to ignore the sktest results?
Regards
Brendan
*
* For searches and help try:
* http://www.stata.com/support/faqs/res/findit.html
* http://www.stata.com/support/statalist/faq
* http://www.ats.ucla.edu/stat/stata/