Peter,
compute Tscore = (50 + ( 10* (( var - mean) / sd ) ) ) ) .
where var is the variable that you are transforming, mean is the mean of the
variable, and sd is the standard deviation.
T scores are used, like z scores, to represent how far a case is above or
below the mean in standardized terms. A case that is one standard deviation
above the mean has a z-score of 1 and a T - score of 60, two standard
deviations above the mean z = 2 and T = 70.
For percentile rank scores,
compute prscore = (100 * ( CDFNORM(zscore) ) .
where zscore = ( ( var - mean) / sd ) .
The percentile rank score will tell you the percentage of cases that fall
below a specific value.
HTH,
Stephen Brand
For personalized and professional consultation in statistics and research
design, visit
www.statisticsdoc.com
-----Original Message-----
From: SPSSX(r) Discussion [mailto:
[hidden email]]On Behalf Of
<Peter M?>
Sent: Monday, February 19, 2007 2:55 AM
To:
[hidden email]
Subject: T-score & percent ranges
Hello to everybody!
I need some help:
I have some variables from a questionnaire and have the sum.
Now i want the t-score?
How can I do this using syntax?
And how can I get the percent ranges?
When is it useful to use T- Scores or percent ranges?
Thanks for your help!
Peter
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