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Re: st: summary statistics
Lars Folkestad <email@example.com>
Re: st: summary statistics
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.
Den 01/10/2012 kl. 19.05 skrev "Donald Spady" <firstname.lastname@example.org>:
> 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.
> On 2012-10-01, at 10:33 AM, Nick Cox <email@example.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.
>> On Mon, Oct 1, 2012 at 5:14 PM, Clyde B Schechter
>> <firstname.lastname@example.org> 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
>>> 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.
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> Donald Spady
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