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st: log transformation question


From   mbarreto@uci.edu
To   statalist@hsphsun2.harvard.edu
Subject   st: log transformation question
Date   Thu, 17 Jun 2004 09:50:06 -0800

2 questions:

** 1 **
i am transforming a bunch of variables into their natural logs, and i 
have read conflicting advice on how to treat the negative values, such 
as growth, which ranges from -99 to +300 in my dataset.

one website suggests i just add +100 to the variable and then log it

gen log_growth = ln(growth+100)

a second website i visited suggests turning all negative values into 0

gen log_growth = ln(growth)
(75 missing values generated)

recode log_growth .=0

** 2 **

once i get all my variables into the appropriate log form, what is the 
difference between using regress and cloglog, because they give me 
different results.

thank you!
matt


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