Re: t-value

[Jonathan Stickel]

John W. Eaton wrote:
> On 23-Apr-2008, Jonathan Stickel wrote:
>
> | OK, I made some revisions to the help text for tcdf and tinv.  I used 
> | mercurial sources and did a "hg commit".  Is that the right thing to do? 
> |   I've seen "changesets" submitted to the list instead, but I don't see 
> | how to save a changeset to a file.  Please excuse me if this is 
> | documented on the octave website, but I couldn't find information there 
> | either.
>
> After committing to your local archive, run
>
>   hg export REV
>
> to display the changeset for revision REV.  You can use "tip" as the
> REV number if you are interested in the latest changes.  Redirect the
> changeset to a file and send that as a text/plain attachment.
>
> jwe

OK, easy enough now that I know how.  The changeset file is attached.

Maybe a "how to submit changes" paragraph could be added to the "Help 
Wanted" part of the webpage?

Regards,
Jonathan

# HG changeset patch
# User address@hidden
# Date 1208962667 21600
# Node ID 53c43e30fbf2f583fc4635f49e63cfd0d0366339
# Parent  1b954fdaf4ff447a75754133506a3e2332615cc7
added to the help text for tcdf and tinv

diff -r 1b954fdaf4ff -r 53c43e30fbf2 scripts/statistics/distributions/tcdf.m
--- a/scripts/statistics/distributions/tcdf.m   Mon Apr 21 11:03:39 2008 -0400
+++ b/scripts/statistics/distributions/tcdf.m   Wed Apr 23 08:57:47 2008 -0600
@@ -18,9 +18,9 @@
 
 ## -*- texinfo -*-
 ## @deftypefn {Function File} {} tcdf (@var{x}, @var{n})
-## For each element of @var{x}, compute the CDF at @var{x} of the
-## t (Student) distribution with @var{n} degrees of freedom, i.e.,
-## PROB (t(@var{n}) <= @var{x}).
+## For each element of @var{x}, compute the continuous distribution
+## function (CDF) at @var{x} of the t (Student) distribution with
+## @var{n} degrees of freedom, i.e., PROB (t(@var{n}) <= @var{x}).
 ## @end deftypefn
 
 ## Author: KH <address@hidden>
diff -r 1b954fdaf4ff -r 53c43e30fbf2 scripts/statistics/distributions/tinv.m
--- a/scripts/statistics/distributions/tinv.m   Mon Apr 21 11:03:39 2008 -0400
+++ b/scripts/statistics/distributions/tinv.m   Wed Apr 23 08:57:47 2008 -0600
@@ -18,9 +18,11 @@
 
 ## -*- texinfo -*-
 ## @deftypefn {Function File} {} tinv (@var{x}, @var{n})
-## For each component of @var{x}, compute the quantile (the inverse of
-## the CDF) at @var{x} of the t (Student) distribution with parameter
-## @var{n}.
+## For each probability value @var{x}, compute the the inverse of the
+## continuous distribution function (CDF) of the t (Student)
+## distribution with degrees of freedom @var{n}.  This function is
+## analagous to looking in a table for the t-value of a single-tailed
+## distribution.
 ## @end deftypefn
 
 ## For very large n, the "correct" formula does not really work well,