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st: Question on Logit/Probit

From   "David Cobey" <>
To   <>
Subject   st: Question on Logit/Probit
Date   Mon, 26 Mar 2007 00:03:23 -0400

I'm trying to estimate the percentage of an area under high yield variety
crops as time changes. I hoping to estimate a basic S shaped technology
diffusion model.  Can I use logit and probit for a continuous dependant
variable ranging from 0-1 or does logit/probit only work for discrete
If logit and probit won't work, how should I estimate this S shaped model?

Example of data - 
Year    Percentage
1965	    0
1966      .1
1967      .3
1968      .6
1969      .8
1970      .9
1971      1


-----Original Message-----
From: David Cobey [] 
Sent: Saturday, March 24, 2007 6:15 PM
To: ''
Subject: RE: Data management

Other people may have better ideas but here is what I would do.
I would create a temporary variable for each id to hold the changes and then
copy them over all at once.


egen id= group(code)
gen temporary_id = .

replace temporary_id=3 if id==1;
replace temporary_id=5 if id==2;
replace temporary_id=8 if id==3;


id = temporary_id
drop temporary_id

Hope this helps,

-----Original Message-----
[] On Behalf Of Roy,Suryadipta
Sent: Saturday, March 24, 2007 5:59 PM
Subject: st: Data management


I have a panel data of (say) 100 countries for 10 years. I 
am trying to attach identification numbers for these 
countries based on another dataset for merging purposes 
later on. So, I started with

a. egen id= group(code), where "code" is the code numbers 
of these countries, e.g. ABW, AFG etc.

b. Then I am trying to replace these id-s with
replace id=3 if id==1;
replace id=5 if id==2;
replace id=8 if id==3;

But the 3rd line of the command is replacing the first set 
of id-s also. I would greatly appreciate if someone can 
suggest how to take care of this.

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