Chi-squared approximation may be incorrect

Published by onesixx on

https://stats.stackexchange.com/questions/81483/warning-in-r-chi-squared-approximation-may-be-incorrect

It gave the warning because many of the expected values will be very small and therefore the approximations of p may not be right.

In R you can use chisq.test(a, simulate.p.value = TRUE) to use simulate p values.

However, with such small cell sizes, all estimates will be poor. It might be good to just test pass vs. fail (deleting “no show”) either with chi-square or logistic regression. Indeed, since it is pretty clear that the pass/fail grade is a dependent variable, logistic regression might be better

 

 

Categories: Analysis

onesixx

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