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st: RE: Graphical questions(box, histogram, pnorm)


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: Graphical questions(box, histogram, pnorm)
Date   Wed, 26 Aug 2009 16:29:32 +0100

1) This sounds bad. Your Stata installation may be messed up: e.g.
executable and ados not updated synchronously. Sort that out before
addressing 2) and 3). 

2) Superimpose a call to -twoway function- using the -addplot()- option.


3) Sounds like a skewed t distribution. Any analogue of -pnorm- is
programmable. In fact it can be done without heavy programming, as it is
just a scatter plot. 

Nick 
n.j.cox@durham.ac.uk 

Beatrice Crozza

I am not able to solve some graphical problems:

1) I would like to do to a box graph.
If I use the following command:
graph7 return, box
everything is fine, however I cannot modify this graph.
When I use the new command:
graph box return
I receive this error message: variable _variables not found
r(111);.What I am doing wrong?

2) I did the histogram of my data and I added a normal distribution:
histogram return, normal
Now, I would like to add to my histogram also a Student's t
distribution. Is there a way to do this?

3)  I did the standardized normal probability plot:
pnorm return
Is there a way to do the same for a sweked t distribution. I saw it in
a paper, but I don't know how to replicate it.


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