The factor score coefficients apply to the standardized (z-scores) values of
the variables, i.e. the original values minus the mean, divided by the
standard deviation.
Hector
-----Mensaje original-----
De: SPSSX(r) Discussion [mailto:
[hidden email]] En nombre de Ivana
Sinkovic
Enviado el: Friday, July 28, 2006 12:21 PM
Para:
[hidden email]
Asunto: Regression equation
Dear all,
I was conducting factor analysis (principal components) and I was
wondering what is the equation for calculating factor scores for each
subject. I saved them as regression, but the results that I get by hand,
(using y=b1x1*b2x2*b3x3... equation, where b is factor coefficient and x
observed value on a variable, which I believed that was the right one) and
the ones that SPSS calculates do not match. Is the equation correct?
Then I have realized that I have zeros as values on all variables included
in factor analysis, but factor scores are different from zero (when they
should not be if the equation was correct).
It then crossed my mind that I might be needing a constant in my equation,
but I have no idea how to calculate it?
So, if there is anyone who knows what is the equation for calculating
factor scores, I would be very greatful to him/her if they would share that
with me.
Thanks in advance
Best regards to all,
Ivana
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