Date: Tue, 16 Mar 2004 09:43:07 -0500
Reply-To: Peter Flom <flom@NDRI.ORG>
Sender: "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU>
From: Peter Flom <flom@NDRI.ORG>
Subject: Re: Sas/Stat Question?
Content-Type: text/plain; charset=US-ASCII
Before you can figure out what PROC you want in SAS STAT, you have to
figure out what statistic you want in general. And before we can help
you do that, you need to tell us what your variables are. Below, I take
some guesses, but guesses have a way of being wrong.
Assuming that the first column is an ID number, you have nested data.
This can be dealt with, but it's complex. The second and third column
seem fairly clear to be date and sex. The fourth column looks like a
time variable, but either you are doing your experiments in the middle
of the night, or you have to recode to make AM and PM clear.
It's not so important how many YEARS of data you have, but rather how
many people you have data on (unless you think hand dominance will
change over the years; this could be, but probably not for the most
recent 20 years - attempts to "force" left handers to be right handers
started to fade quite a while back.
Next, from your statement that 'they want statistics on hand dominance
male vs. female for different activities" it seems like the model you
is something like
hand pref = fx(sex + activity)
If I am correct that you have nested data, this woiuld require PROC
NLMIXED; this is a very powerful PROC, and should be used more often,
IMHO, but it's not simple to use. The fact that you have other
covariates available is good, but do you have any reason to suspect that
they are related to hand dominance? (maybe age would be.....). As to
your hypothesis that hand dominance might vary by day of the
week.....well, it can be investigated, but it seems far fetched to me.
Finally, as to 'p-values, std dev. and any other calculations you can
see that might be useful......' ..... well, p-value of WHAT exactly? Std
dev. of what?
In short, you have a complex set of problems. If you are not
statsticially sophisticated, I suggest you hire a consultant.
Peter L. Flom, PhD
Assistant Director, Statistics and Data Analysis Core
Center for Drug Use and HIV Research
National Development and Research Institutes
71 W. 23rd St
New York, NY 10010
(212) 845-4485 (voice)
(917) 438-0894 (fax)
>>> "Ross, Michael D" <michael.ross@ASTRAZENECA.COM> 3/16/2004 9:19:52
I'm very new to Sas/Stat. I'm trying to figure out how to calculate
p-value, std deviation and any other calculations that you can see
would be useful for the data below: I have about 20 years worth of
where they want statistics on hand dominance Men vs. Women during
activities (so the hand can change pending upon the activity). I also
variables like weight, height, DOB.
Also, I'd like to find out maybe who felt more dominant on a specific
of the week.
1 Male 01JAN2000 0900 Left Handed Frizbee
1 Male 02JAN2000 0700 Left Handed Basketball
1 Male 03JAN2000 0900 RightHanded Baseball
2 Male 04JAN2000 0400 RightHanded Tennis
2 Male 05JAN2000 0100 Left Handed Basketball
2 Male 06JAN2000 0200 RightHanded Football
3 Female16JAN2000 0200 RightHanded Baseball
3 Female26JAN2000 0200 Left Handed Baseball
3 Female06JAN2000 0200 RightHanded Basketball
Thanks for all your help!