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Re: st: Re: Using xml_tab


From   "Zurab Sajaia" <zsajaia@hotmail.com>
To   <statalist@hsphsun2.harvard.edu>
Subject   Re: st: Re: Using xml_tab
Date   Mon, 2 Mar 2009 17:10:57 -0500

Not exactly, you can still use format() option as well as -long- and -wide- when outputting matrices.

As for the significance levels, problem is that when you write "xml_tab A" matrix A can be any matrix (say 3 columns and 14 rows) program doesn't know what those three columns correspond to, this mode is used to output any matrix to xml file. So in this general case xml_tab "won't know" how to calculate significance levels. but it looks for a matrix A_STARS (for the main matrix A), and if it exists uses values to assign stars. A_STARS would have 4 numbers in it: 0, 1 ,2, or 3. 0 corresponding to no stars, 1 to the highest significance level (p<0.01 by default - ***) 2 - next level (p<0.05 - **) and 3 to the lowest level (p<0.1 *). But this means that user will need to calculate this levels and form the matrix A_STARS manually.

General idea when I was writing this part was that results come from some other routine or source in a form of a matrix and xml_tab just outputs it in a "similar" way to it's own estimation outputs.

I guess it can be useful to have option coefonly or something while outputting estimation results, so that user's will be able to see significance and also other statistics together with betas. I'll post update as soon as I have some progress on that.

Zurab


----- Original Message ----- From: "Alan Neustadtl" <alan.neustadtl@gmail.com>
To: <statalist@hsphsun2.harvard.edu>
Sent: Monday, March 02, 2009 4:20 PM
Subject: Re: st: Re: Using xml_tab


Thank you for your examples.  After working through them and returning
to the help file it seems that there is a trade-off between writing
out stored estimations and matrices.

Writing out stored estimations allows significant control over the
format and layout of the table but does not allow for things like
renaming the rows or dropping the standard errors.

Writing out matrices allows control over the row labels but not cell
formatting and outputting significance levels (stars) and other
statistics (e.g. R2, etc.).

Am I understanding the difference between the two methods correctly?

Best,
Alan

On Mon, Mar 2, 2009 at 3:45 PM, Zurab Sajaia <zsajaia@hotmail.com> wrote:
Hi Alan,

To see variable names instead of (default) labels, you can use -nolabel-
option;
-xml_tab- can also output matrices directly, so you can accumulate your
betas into a matrix and then use xml_tab:

(from your example):
...
regress mpg weight
matrix A = e(b)'
regress mpg weight foreign displacement
matrix B = e(b)'

xml_tab A B, {options}
...

when exporting a matrix, -xml_tab- reads matrix rownames (and row equations if present), so to modify text in the rows you can either form the names for
your matrix, i.e.
matrix rownames A = "this is row 1" "and row 2" (for the third row
"displacement" will remain as the name)

or use -xml_tab-'s option rnames():
xml_tab A B, rnames("this is row 1" "and row2")

when merging two matrices of different size -xml_tab- puts .z by default for the added cells (I guess I'll have to change this default), but if you want
to use any other text, or blank you can specify -mv- option:

xml_tab A B, mv(.z="(missing)") // replace .z missing values with text
"(missing)"
or
xml_tab A B, mv("") //all the missing values, not only .z will be replaced
by the empty cells

Hope this helps,
Zurab


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