Eric --
Good comment!
Also, it is helpful to keep in mind that:
t^2 (df2) = F(1,df2)
-- Joe
********************************
Joe Ward
167 East Arrowhead Dr.
San Antonio, TX 78228-2402
Home phone: 210-433-6575
Home fax: 210-433-2828
Email: [EMAIL PROTECTED]
http://www.ijoa.org/joeward/wardindex.html
--------------------------------
Health Careers High School
4646 Hamilton Wolfe
San Antonio, TX 78229
Phone: 210-617-5400
Fax: 210-617-5423
********************************
----- Original Message -----
From: "Eric Bohlman" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Monday, April 16, 2001 3:43 PM
Subject: Re: Student's t vs. z tests
> Mark W. Humphries <[EMAIL PROTECTED]> wrote:
> > Hi,
>
> > I am attempting to self-study basic multivariate
statistics using Kachigan's
> > "Statistical Analysis" (which I find excellent btw).
>
> > Perhaps someone would be kind enough to clarify a point
for me:
>
> > If I understand correctly the t test, since it takes
into account degrees of
> > freedom, is applicable whatever the sample size might
be, and has no
> > drawbacks that I could find compared to the z test. Have
I misunderstood
> > something?
>
> You're running into a historical artifact: in pre-computer
days, using the
> normal distribution rather than the t distribution reduced
the size of the
> tables you had to work with. Nowadays, a computer can
compute a t
> probability just as easily as a z probability, so unless
you're in the
> rare situation Karl mentioned, there's no reason not to
use a t test.
>
>
>
>
============================================================
=====
> Instructions for joining and leaving this list and remarks
about
> the problem of INAPPROPRIATE MESSAGES are available at
> http://jse.stat.ncsu.edu/
>
============================================================
=====
=================================================================
Instructions for joining and leaving this list and remarks about
the problem of INAPPROPRIATE MESSAGES are available at
http://jse.stat.ncsu.edu/
=================================================================
