Automate text based on p-value in a t-test

[Pratap Pundir]

I am using `ttest` inside a `forvalues` loop to run the test across a bunch of values.

Is it possible to generate inside the loop, some text based on the p value for Ha: s != 0? e.g. something even as simple as "Reject H0" if p<0.05

[Clyde Schechter]

Yes. Inside the loop, immediately after the -ttest- command you can put something like this:

if r(p) < 0.05 {
    display "Reject H0"
}

[Dennis Lund Hansen]

something like:

sysuse auto
ttest price, by(foreign )
return list

foreach v of varlist price mpg rep78 headroom trunk weight {
    quietly ttest `v', by(foreign)
    if `r(p)' > 0.05 {
        display "H0 not rejected, p=`r(p)'"
        }
        
    else {
        display  "H0 rejected, p=`r(p)'"
        }
    }

?

EDIT: sorry, forgot to reload the page, Didn't see, that Schechter had given an answer

[Dennis Lund Hansen]

the line:

 
 if `r(p)' > 0.05

shall of course be:

 
 if `r(p)' >= 0.05

[Pratap Pundir]

Thanks! You guys are stars.

[Attaullah Shah]

If you want to export results from ttest commands to a word document, you can use asdoc (from SSC). For example

ssc install asdoc
sysuse auto, clear
asdoc ttest rep78==0, replace title(T-test results : H0: mean = 0) tzok dec(2)
asdoc ttest price==0, rowappend tzok dec(2)
asdoc ttest mpg==0, rowappend tzok dec(2)
asdoc ttest turn==0, rowappend tzok dec(2)
asdoc ttest weight==0, rowappend tzok dec(2)
asdoc ttest length==0, rowappend tzok dec(2)
asdoc, text(\i Reject H0 if p<0.05)

[Biraj Bisht]

Hi Prof. Shah, I tried to replicate your code block above, however, I keep getting an error from Microsoft word. I have posted the error message below. Is there an easy solution to this issue?

Word was unable to read this document. It may be corrupt.
Try one or more of the following:
* Open and Repair the file.
* Open the file with the Text Recovery converter.
(Myfile.doc)

I am using Microsoft Word for Mac version 16.14.1 and Stata 15.

Thank you for your help.

[Attaullah Shah]

Biraj Bisht I think the problem is caused by using asdoc on Mac. I remember adding support for Mac in asdoc. Can you please try the beta version from my website and tell me whether that solves the problems.


* For installation of the new beta version

net install asdoc, from(http://fintechprofessor.com) replace
help asdoc

[Attaullah Shah]

The new version of asdoc has been uploaded to the SSC. Details of the updates are given in this post
https://www.statalist.org/forums/for...ord-from-stata