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st: RE: reinstate data after -contract- and -reshape-

From   "Martin Weiss" <[email protected]>
To   <[email protected]>
Subject   st: RE: reinstate data after -contract- and -reshape-
Date   Sat, 28 Nov 2009 21:28:44 +0100

The "advanced syntax" of -reshape- let`s you undo the previous -reshape- in
a straightforward manner, but -contract- can only be undone via -expand-.
Have you had a look at -preserve- and -restore-, though?


-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Michael McCulloch
Sent: Samstag, 28. November 2009 21:21
To: Statalist Statalist
Subject: st: reinstate data after -contract- and -reshape-

Dear Statalist members,
With the help of Nick Cox and Martin Weiss, I've created the following  
data simulation for a graph to track research subject accrual.
My question is how to reinstate the original dataset after the  - 
contract- and -reshape- commands. I know it's possible to -reshape-,  
but not sure how to "reverse" the options. I don't think it's possible  
to "-uncontract'", so I'm thinking some version of -restore-??

My understanding of those two commands is:
	-contract- makes a summary dataset of frequencies and percentages  
that will be reported in the graph, and
	-reshape- puts them in wide form so they can be -stacked-

* Austin Nichols suggests:
clear all
set seed 1
set obs 1000
gen id=_n
gen month=1 + int(12*uniform())
gen year=2008 + int(2*uniform())
gen subject_type=1 + int(3*uniform())
la def lab_subjects 1 "no reply" 2 "screened" 3 "sampled", modify
la val subject_type lab_subjects
g m=(year-1960)*12+month-1
format m %tmm_CY
la var m "Calendar month"
levelsof m, loc(vs)
foreach v of loc vs {
la def m `v' "`:di `:format m' `v''", modify
la val m m
by m, sort: gen freq = _N		// sort by the variable of interest
and get  
the frequencies
by m: gen cumfreq = _N if _n == 1	// get the cumulative frequencies
replace cumfreq = sum(cumfreq)
tabdisp m, cell(freq cumfreq)
contract m subject_type, z f(one)
reshape wide one, j(subject_type) i(m)
g noreply=max(0,one1)
g screened=max(0,one1)+max(0,one2)
g sampled=max(0,one1)+max(0,one2)+max(0,one3)
sc sampled screened noreply m, recast(bar) xla(576/599,angle(90))  

Best wishes,

Michael McCulloch
Pine Street Foundation
124 Pine Street
San Anselmo, CA 94960-2674
tel:	415-407-1357
fax: 	206-338-2391

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