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From |
Jean-Benoit Hardouin <jean-benoit.hardouin@orscentre.org> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: Variable label with -biplot- |

Date |
Thu, 29 Sep 2005 22:13:16 +0200 |

Ken,

Thank you very much for this tip !

This is a nice solution and I will try to write a more complete ado file to create automatically a such biplot with a nice displaying !

Jean-Benoit Hardouin

khigbee@stata.com a écrit :

Jean-Benoit Hardouin <jean-benoit.hardouin@orscentre.org> asks:

I search to display in a biplot graph (obtained with -biplot- under Stata 9) the labels instead of the names of the variables. Is it possible ? I have not found any help in the manual about that.Assuming the variable labels were reasonably short and more

descriptive than the variable names, it seems a reasonable thing

to want.

My first guess came from looking at -help biplot- and looking at

the -colopts()- option which allows pcarrow_options as suboptions

(which in turn allow for marker_label_options -- see help

marker_label_options). From this I see that I can ask for a

change in the default size of the labels with

. biplot ... , colopts(mlabsize(huge))

(which produces "huge" labels) and I could change the color, the

gap, the position, etc. The suboption I had hoped would be of

help was

colopts(mlabel(...))

where I would create a variable before calling -biplot- that

contained the variable labels and pass that in through

-colopts(mlabel())-. but the -mlabel()- suboption is not allowed

in the -colopts()- option of -biplot-.

The reason is that Stata's -graph- system thinks in terms of

observations, and the information of the variables (columns) in

-biplot- has to be handled in a special way. -biplot- hijacks

the -mlabel()- option to accomplish the task.

Assuming that seeing the variable names in your graphs is

sufficient for your initial explorations using -biplot- and that

the variable labels are only needed when you are producing your

final biplot (for publication), here is what I would do.

I use the auto dataset as a quick example

sysuse auto

biplot turn trunk mpg

Assuming that this graph is what I want except that I want to

replace "turn", "trunk", and "mpg" in the graph with "Turning

Circle", "Trunk space", and "Mileage" (wording similar to what is

in the variable labels for these 3 variables) I would look at the

y and x locations where the labels should land in the graph and

use that information to directly place the text using the

-text()- option (see twoway_options and follow that to

added_text_option) while suppressing the default labels with the

-colopts(nolabel)- option.

biplot turn trunk mpg, colopts(nolabel) text(0.3 -4.5

"Turning Circle" -5 -4.5 "Trunk space" -3.4 5 "Mileage")

(treat the 2 lines above as one line.)

If you are needing to do this a lot you might want to write a

wrapper command that will take care of a lot of this for you

automatically. Here is a beginning draft of such a command:

=================== begin of biplotvlab.ado =========================

*! version 1.0.0 29sep2005

program biplotvlab

version 9

syntax varlist(numeric min=2) [if] [in] [, *]

// run biplot quietly (and nograph) so we can get r(V)

qui biplot `varlist' `if' `in' , `options' nograph

tempname V

mat `V' = r(V)

// build the -text()- option

local topt "text("

local i 0

foreach v of local varlist {

local ++i

// y value

local topt `"`topt' `= `V'[`i',2]'"'

// x value

local topt `"`topt' `= `V'[`i',1]'"'

// variable label

local topt `"`topt' `"`: var label `v''"' "'

}

local topt `"`topt')"'

// call with -colopts(nolabel)- and -text()- just built

biplot `varlist' `if' `in', `options' colopts(nolabel) `topt'

end

===================== end of biplotvlab.ado =========================

Then I would call this as follows

biplotvlab turn trunk mpg

Notice that -biplotvlab- places the variable labels right on the

ends of the arrows. You probably want to add logic to the code

for moving them out a bit from the ends of the arrows. If so,

replace the

`= `V'[`i',2]' and `= `V'[`i',1]'

with more elaborate code.

If anyone wants to take over this code and enhance it, that is

fine with me. I just wanted to point out the beginning direction

for a solution.

Ken Higbee khigbee@stata.com

StataCorp 1-800-STATAPC

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**Follow-Ups**:**st: multinomial logistic regression: adjacent logits***From:*"Yi-Fu Chen" <yifuc@uga.edu>

**References**:**Re: st: Variable label with -biplot-***From:*khigbee@stata.com

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