STATA HELP - How can I tell if the percentages are different statistically?

[Sam]

Hi,
I am trying to compare the percentage of students in reading, math and science (by school, and by subject). My table looks like this.

reading math science

School A 20% 20.6% 19.4%
School B 28.9% 28.3% 25%
School C 25% 7.7% 44%
School D 15.2% 15.2% 18.2%

What statistical tests can I use to compare these? Any help would be appreciated.

 

[hlsmith]

Chi-Square or Fisher's exact tests. It would be better if you had the actual numbers instead of percentages. You may also want to look up the topic of familywise error and multiplicity.

 

[duskstar]

In Stata, something like -nptrend- or -ptrendi- (user written command) will help here. Actual numbers will help though