Bookmark and Share

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.


[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: st: summary statistics


From   Lars Folkestad <lfolkestad@health.sdu.dk>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   Re: st: summary statistics
Date   Tue, 2 Oct 2012 13:39:27 +0200

Using preserv // restore prior and after the collapse code would preserve your data and not destroy it - As you say. 

I must ad i have not tried tabm or tab_chi but i definatly will.

Mvh
Lars Folkestad


Den 01/10/2012 kl. 19.05 skrev "Donald Spady" <dspady@ualberta.ca>:

> Thanks to both of you for your comments and alternative approaches.  I liked the original in that it does not destroy the data, as collapse would do, however, it is nice to know there are several possible ways of getting what I want.  Nick is also correct in that I am not overly fluent in Stata; I have used it for several years, and am comfortable in general, but only with the basics and what I use on a regular basis.
> 
> Don
> 
> On 2012-10-01, at 10:33 AM, Nick Cox <njcoxstata@gmail.com> wrote:
> 
>> Actually, I pointed to _two_ user-written commands that do this.
>> 
>> In general, I agree with Clyde. The trade-off between doing it
>> yourself from first principles and finding a suitable user-written
>> command (or even an official one) is delicate, and always with a user.
>> However, the success of Clyde's approach depends partly on his being
>> an experienced user who is fluent in, and feels comfortable with, much
>> of Stata.
>> 
>> With a structure this simple, a two-line solution is also competitive.
>> 
>> stack HSS*, into(HSS) clear
>> tab _stack HSS
>> 
>> -- although that loses some detail on variable names and labels, and
>> so does not qualify as a good solution by itself.
>> 
>> However, the full trade-off needs to take account of various awkward facts:
>> 
>> 1. You might want to do this repeatedly.
>> 
>> 2. You might (almost certainly will) want to go back to your original
>> data structure.
>> 
>> 3. You might want to carry weights through the -reshape- too.
>> 
>> As said, I am in agreement, just spelling out some issues.
>> 
>> Nick
>> 
>> On Mon, Oct 1, 2012 at 5:14 PM, Clyde B Schechter
>> <clyde.schechter@einstein.yu.edu> wrote:
>>> Don Spady was looking for a command that would take variables HSS1-HSS18, each with a discrete 1 to 5 response set and create a table like:
>>> 
>>>               Col 1    Col2     Col 3    Col 4   Col5
>>> HSS1        n1            n2            n3             n4           n5
>>> HSS2        n1            n2            n3             n4           n5
>>> HSS3
>>> 
>>> And Nick Cox pointed him to a user-written command that does this.
>>> 
>>> I would just add that this can also be easily done using a few built-in Stata commands:
>>> 
>>> (I assume there is another variable, called id, which identifies the observations.  If not, it can be generated first)
>>> 
>>> reshape long HSS, i(id) j(varnum)
>>> collapse (count) Col = id, by(varnum HSS)
>>> reshape wide Col, i(varnum) j(HSS)
>>> gen variable= "HSS"+string(varnum)
>>> list variable Col*, noobs clean
>>> 
>>> 
>>> I suppose it is a matter of taste which way to do these things.  In general, if it is something I do repeatedly, I find the convenience of a single command (which I might write an ado file for myself) worthwhile.  But if it's a one-off, it's generally faster to write a few lines of code and also not later be bothered with trying to remember what some unfamiliar command name means.
>> 
>> *
>> *   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/
>> 
> 
> Donald Spady
> 
> --
> dspady@ualberta.ca
> 
> 
> 
> 
> 
> *
> *   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/

*
*   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/


© Copyright 1996–2014 StataCorp LP   |   Terms of use   |   Privacy   |   Contact us   |   Site index