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st: Stata11 cannot estimate xthtaylor with bootstrap SE

From   "Mike Kim" <>
To   <>
Subject   st: Stata11 cannot estimate xthtaylor with bootstrap SE
Date   Mon, 24 Aug 2009 10:58:14 -0500

Dear all,

I am estimating 'xthtaylor" with bootstrap standard error.

xthtaylor depvar indepvars, endog(vars) vce(boot)

Stata10 gives estimation results with the following notation.

Bootstrap replications (50)
----+--- 1 ---+--- 2 ---+--- 3 ---+--- 4 ---+--- 5
.....xx....x..xx.x......x.x........xx.x...x....x..    50

However, Stata11 cannot estimate the model. It says:
o. operator not allowed
an error occurred when bootstrap executed xthtaylor
r(101); says:
"As of Stata 11, variables are no longer dropped because of collinearity. 
Instead, these variables are omitted and are labeled with the "o." operator 
in the column names of the resulting parameter vector."

My questions are:

1. What does "xx...x..xx" mean in Stata10?
2. Why can't Stata11 estimate the model with the same code?
3. What is the difference between "dropping" and "omitting" a variable due 
to collinearity?

Thank you for your help in advance.


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