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st: sqreg, extremely small coefficients, no standard error and t report


From   Chuanjian Bao <cbao@clemson.edu>
To   statalist@hsphsun2.harvard.edu
Subject   st: sqreg, extremely small coefficients, no standard error and t report
Date   Thu, 16 Aug 2012 14:30:04 -0400

Hi friends,

I run a quantile regression using -sqreg-. With the results of q[25]
and q[75] being normal, that of q[50] is a little bit weird. All the
coefficients except the constant of q[50] equation are extremely
small, i.e., less than one billionth. And all the other columns of
q[50] equation are nothing but dots. The constant equals exactly to
the median of the dependent variable of the sample.

In addition, I run a qreg, whose default quantile value is the median.
The coefficients and the standard error are both extremely small. And
the constant equals to the median of the dependent variable.

Any suggestions on what the problem is will be highly appreciated.

Best,

Vincent
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