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st: RE: RE: RE: clorenz syntax

From   "Nick Cox" <>
To   <>
Subject   st: RE: RE: RE: clorenz syntax
Date   Mon, 30 Jun 2008 19:33:17 +0100

That it is a user-written programme is just a fact; mentioning that
signals to others that they might need to install it before they can use
it. In this field most of the good stuff is user-written, but that is
not in itself a problem. 

Others know more about this than I do but I imagine that you should use
-glcurve-, as already advised, generate new variables containing curve
coordinates, and then "subtract" one curve from another. I guess that
subtraction might at worst entail interpolation to ensure that curves
were measured for the same coordinates. I can't advise further. 


Shehzad Ali

Thanks, Nick. You rightly pointed out that it's a user written
The reason I wanted to use -clorenz- is that it plots the difference
concentration curves. I don't think -glcurve- does that. Do you know of
other way of plotting the difference between concentration curves?

Nick Cox

-clorenz- is a user-written program from SSC. (As I often point out, you
are asked to explain where user-written programs you refer to come

I've not used it ever, but a glance at the help file indicates that
there is no way that it will support your syntax. The syntax is of
standard form 

syntax varlist [, <options> ] 

so that I do not know why you expect it to support 

syntax (varlist , <options>) (varlist, <options>)

The program also seems to lack some standard features (e.g. support for
-if- or -in-) and to be written in sub-standard style (e.g. uses
variable names that may already be in use). 

I suggest that you check out -glcurve- by Philippe van Kerm and Stephen
Jenkins on SSC. 
That's well written, well documented and well supported. 


Shehzad Ali

Maybe I am doing something wrong with the syntax here. I am trying to
the difference between concentration curves using - clorenz -. Can I
two differences on the same graph? Here is what I am trying to do but am
getting syntax error.

clorenz (x1 y1, hweight(weight) rank(rank1) dif(c1)) (x2 y2,
rank(rank2) dif(c1))

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