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Re: st: matrix colnames, Kronecker direct products, and factor variables
From
Steve Samuels <[email protected]>
To
[email protected]
Subject
Re: st: matrix colnames, Kronecker direct products, and factor variables
Date
Wed, 4 Dec 2013 18:35:20 -0500
Note that factor variable names are not equation names. The following version (you seem to have switched A & B) produce column names that are a combination of those from A & B.
matrix colnames B = eqn1:_new eqn1:_old
matrix C = A # B
Steve
On Dec 4, 2013, at 3:02 PM, Doug Hemken wrote:
I don't get what I expect. The documentation I find says the columns of the product matrix, A # B, will have names from matrix B and equation names from matrix A?
But if I have factor variable names for the columns of A, they simply disappear in the product. (I also notice that when I assign column names that appear to be factor variables or interaction terms, Stata alters my labels, usually for the better.)
For example:
matrix A = (1,21 \ 0 ,1)
matrix colnames A = _cons mpg
matrix B = I(2)
matrix colnames B = 0.foreign 1.foreign
matrix C = B' # A
matrix list A
matrix list B
matrix list C
The column labeling on C is not what I expect!
--
Doug Hemken
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