Notice: On March 31, it was announced that Statalist is moving from an email list to a forum. The old list will shut down on April 23, and its replacement, statalist.org is already up and running.

# Re: st: dropping the lowest three observations

 From Nick Cox To statalist@hsphsun2.harvard.edu Subject Re: st: dropping the lowest three observations Date Thu, 14 Feb 2013 18:56:44 +0000

```See

SJ-9-1  pr0046  . . . . . . . . . . . . . . . . . . .  Speaking Stata: Rowwise
(help rowsort, rowranks if installed) . . . . . . . . . . .  N. J. Cox
Q1/09   SJ 9(1):137--157
shows how to exploit functions, egen functions, and Mata
for working rowwise; rowsort and rowranks are introduced

It sounds like -rowsort- followed by -egen, rowmean()-.

http://www.stata-journal.com/sjpdf.html?articlenum=pr0046

Alternatively, -reshape- and apply -by:-.

Nick

On Thu, Feb 14, 2013 at 6:38 PM, John Levendis

> I'm doing my grading on Stata, and I'd like to drop each student's
> lowest three grades. Each row is a student, and for each student I have
> their quiz grades as Q1, Q2, Q3, and so on. How can I compute their
> average grades while dropping their lowest three Qs? Incidentally, these
> quiz grades are out of 10 pts, so it is quite common for students to
> have multiple quizzes with the same scores. (Some kind of nested rmin()
> function, I'm sure, but I can't figure it out.)
*
*   For searches and help try:
*   http://www.stata.com/help.cgi?search
*   http://www.stata.com/support/faqs/resources/statalist-faq/
*   http://www.ats.ucla.edu/stat/stata/
```