Hello,
In a population of adolescents, I have to compare distribution of Family Affluence Scale (FAS) according to school level (level). I use the FREQ procedure (with chisq option) to do so, and I wonder why SAS does not warn me in the output of expected values under 5.
I know that the chi-square may be valid (because 5 is an empirical choice and is conservative, especially when degrees of freedom and sample size are high, see Agresti "Categorical Data Analysis" for example), but I don't understand why SAS does not warn me. I thought SAS always printed a warning message when expected values were under 5.
Here are the data if you want to try it yourself.
data bonjour;
input FAS$ level$ n;
cards;
1 1 16
2 1 58
3 1 57
1 2 127
2 2 626
3 2 833
1 3 18
2 3 137
3 3 206
1 4 1
2 4 21
3 4 32
1 5 11
2 5 21
3 5 23
;
run;
Any explanation?
Thank you in advance (and pardon my english!)
Gauthier