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Re: st: RE: Create graph directly from matrix?
yes indeed. It is a nifty application of the existing principle that
had not occurred to me!
Nick Cox wrote:
I agree. This is clever. But there is no new principle here. _n in any
expression yielding a new variable is interpreted observation by
observation.
Nick
[email protected]
Nick Winter
Ah, interesting.
Looking within -_matplot-, it looks like the fundamental answer to my
question might be "no", since that program creates temporary variables
that it then plots.
But it uses an interesting construction that may help me go the
variables route without using -svmat-:
gen x = Xy[_n,1] in 1/16
creates a new variable -x- from the first column of matrix Xy. Pretty
spiffy to use _n to tag the observation number/row number.
- Nick
Nick Cox wrote:
Check out the undocumented command -_matplot-.
Nick
[email protected]
Nick Winter
I'm wondering if there is a way to convert the values held into a
matrix
into a graph (ie, into a serset that serves as the basis for a graph)
directly, without first making the matrix into variables?
Why I'm curious:
I'm thinking about revising my -oprobpr- command, which plots
predicted
probabilities after order l/probit models. The new -margins- command
can fairly easily calculate what's required for the plotting, and
those
results can be saved as a matrix, using -margins-'s -post- option.
So I'd like to plot the estimates returned in e(b) against values in
e(at).
I can put this stuff all together in one matrix, eg:
sysuse auto
probit foreign mpg price weight
margins, atmeans at(mpg=(12(2.9)41)) post
mat b = e(b)
mat X = e(at)
mat Xy = X , b'
Then I'd like to create, eg, a line plot of the final column (named
y1)
against the first column (mpg).
I can, of course, use -svmat-, graph the relevant variables, and drop
the variables.
But I'd love a more elegant solution.
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--------------------------------------------------------------
Nicholas Winter 434.924.6994 t
Assistant Professor 434.924.3359 f
Department of Politics [email protected] e
University of Virginia faculty.virginia.edu/nwinter w
PO Box 400787, 100 Cabell Hall
Charlottesville, VA 22904
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