[R] help with simple goodness of fit test
jgant
john.gant at gmail.com
Mon Oct 15 22:38:58 CEST 2007
Hello,
I've read the other posts with regard to "chisq.test" and "goodness of fit"
and am still missing something.
1. I create a simple vector of randomly generated lognormal values with
mean=0 and sd=1;
>d1 <- rlnorm(100,meanlog=0,sdlog=1);
2. I also create a vector of probabilities that are expected for a lognormal
distribution. I suspect this is the culprit.
>pr <- dlnorm(d1,meanlog=0,sdlog=1);
3. I perform the chi-square test on the random data and expected
probabilities.
>c <- chisq.test(d1,p=pr,rescale.p=TRUE);
The output is as follows:
Warning message:
Chi-squared approximation may be incorrect in: chisq.test(d1, p = pr,
rescale.p = TRUE)
> c;
Chi-squared test for given probabilities
data: d1
X-squared = 156992.7, df = 99, p-value < 2.2e-16
I'd expect the "goodness of fit" test to pass, with a high p value. Can
someone tell me why things seem incorrect. Again I apologize for the
simpleton request.
Thanks,
John
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