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st: RE: Re: RE: Re: Memory

From   "Nick Cox" <>
To   <>
Subject   st: RE: Re: RE: Re: Memory
Date   Wed, 12 Nov 2008 17:47:52 -0000

That's removed one source of doubt. What remains is what you mean precisely by a database for a t table, but go to the help for density functions, and look under Student's t. 


Victor M. Zammit

By infinite I mean a large enough number of samples of thirty each,that
brings convergence to my results..The litmus test would be,convergence to
the official t-table.
If there is some analytic solution,that would be great too,but I do not know
where I could getthat from.

Nick Cox

> What do you mean by "infinite" precisely? There are various mathematical
meanings, courtesy of Cantor, but I doubt that you mean any of them.
> Otherwise I can think of three answers to your question.
> 1. -help limits- tells you the limits your Stata has in terms of what it
can do; your machine and OS probably cannot oblige.
> 2. You can set up a dataset with 30 observations and keep sending results
from a loop to a file outside Stata, but in terms of doing anything with
those results in Stata you are back to answer 1.
> 3. What you are doing probably has an analytic solution so that
computation is unnecessary. In particular, Stata's functions will surely
print out a t-table better than any you can get by simulation.

Victor M. Zammit

> I need to t-test an infinit number of random samples of size 30 ,from an
> infinite,normally distributed population.Each t-value is saved and then
> appended together to form a database for t table.The problem is that I get
> constrained by memory regardless of the size of the memory in my Stata.I
> have Version 9 .Is there a way of  getting  around this constrained.?

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