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RE: st: RE: Save -table- command results

From   Nick Cox <[email protected]>
To   "'[email protected]'" <[email protected]>
Subject   RE: st: RE: Save -table- command results
Date   Mon, 12 Mar 2012 15:53:47 +0000

At this distance -statsmat- doesn't seem a very interesting command to change. Kit may be more enthusiastic. 

It's perhaps more instructive to show how to write your own program. I didn't add in weights, but that's not difficult, and I have a meeting somewhere else in a few minutes' time. 

program mysums 
	version 8.2 
	syntax varlist(numeric) [if] [in] , by(varname) [matname(name)] 
	quietly { 
		marksample touse 
		markout `touse' `by', strok 
		count if `touse' 
		if r(N) == 0 error 2000 
		local J : word count `varlist' 
		tempvar group 
		egen `group' = group(`by') if `touse' 
		su `group', meanonly 
		local I = r(max) 
		if "`matname'" == "" local matname "mysums" 
		matrix `matname' = J(`I', `J', 1) 
		tokenize `varlist' 
		forval i = 1/`I' { 
			forval j = 1/`J' { 
				su ``j'' if `group' == `i', meanonly 
				matrix `matname'[`i', `j'] = r(sum) 
		levelsof `by' if `touse' 
		capture matrix rownames `matname' = `r(levels)' 
		matrix colnames `matname' = `varlist' 

[email protected] 

-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Pablo Bonilla
Sent: 12 March 2012 15:33
To: Stata List
Subject: Re: st: RE: Save -table- command results

Dear Nick,

You'r right, I am sorry for not explain the provenance os -statsmat-. 

Thank you for the suggestion, but still it is faster and more efficient to use the -statsmat- command  because the preserver and the collapse commands are very slow in huge data bases like the one I am using.

That would be great if the -statsmat- command can present results with the by() option for several variables.


Sent via BlackBerry from T-Mobile

-----Original Message-----
From: Nick Cox <[email protected]>
Sender: [email protected]
Date: Mon, 12 Mar 2012 14:58:02 
To: '[email protected]'<[email protected]>
Reply-To: [email protected]: st: RE: Save -table- command results

-statsmat- is from SSC (Christopher F. Baum and friend). Please remember to explain the provenance of user-written commands. 

You don't have to use -statsmat- at all to get a matrix. There are many ways of doing it. 

Here is one: 

collapse (sum) var1 var2 var3 var4 var5 [w=factor], by(decil) 
mkmat var*, matrix(mysums) row(decil) 

[email protected] 

Pablo Bonilla

I would like to know if there is a way to save the results from the
-table- command in matrices. I am using the -statsmat- command but It
is very inefficient if I need to use it with the by() option.

For instance, this is what I want to save:
table decil [w = factor], c(sum var1  sum var2 sum var3  sum var4 sum
var5)  f(%19.2f) row

But I have to do it in this way in order to get a matrix:
cap mat drop mat1
foreach var in var1 var2 var3 var4 var5 {
	statsmat `var' [w = factor], by(decile) stat(sum) format(%16.0f)
	mat mat1 = nullmat(INCOME),`income'

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