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RE: st: RE: Graphical questions(box, histogram, pnorm)
1) I think you need to talk to Stata tech support.
2) That won't work because it is not a valid call to -twoway function-. You do need to read the help.
3) No; P-P plots do not involve the density function, but the distribution function.
Nick
[email protected]
-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Beatrice Crozza
Sent: 26 August 2009 17:56
To: [email protected]
Subject: Re: st: RE: Graphical questions(box, histogram, pnorm)
Dear Nick,
thank you very much for your help, however I am still encountering troubles.
1) I checked my ados and executable and they are already up to date.
Is there something else that can I do?
2) I wrote:
histogram return, normal addplot(student(129))
but it doesn't work.
3) For the scatter plot, what should I put on the axis? The p.d.f. of
the Students't?
Thank you very much for any help.
Best,
Bea
2009/8/26 Nick Cox <[email protected]>:
> 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
> [email protected]
>
> 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.
>
>
> *
> * For searches and help try:
> * http://www.stata.com/help.cgi?search
> * http://www.stata.com/support/statalist/faq
> * http://www.ats.ucla.edu/stat/stata/
>
*
* For searches and help try:
* http://www.stata.com/help.cgi?search
* http://www.stata.com/support/statalist/faq
* http://www.ats.ucla.edu/stat/stata/
*
* For searches and help try:
* http://www.stata.com/help.cgi?search
* http://www.stata.com/support/statalist/faq
* http://www.ats.ucla.edu/stat/stata/