Re: iid distribution problem

Posted by David Marso on Sep 15, 2011; 1:30pm
URL: http://spssx-discussion.165.s1.nabble.com/iid-distribution-problem-tp4746052p4806841.html

LOOK at the MIXED procedure.
I will NOT write your syntax.
RTFM and decide which of the various models are applicable to your data.
I hope that the presentation order of the 16 objects were randomized, otherwise ...(fill in the blank).

drfg2008 wrote

Thank you for the informations.

Rich Ulrich-2: Actually I did average across the objects and did a simpler analysis
for testing main effects for age and sex. However, the problem is to measure all variables in one model at the same time (age, sex, IV1 to IV3). Age and sex occur repeatedly (16 time in the data and 6 times in the example here, because each proband rates 16/6 times).  But how to do a repeated measure design in this case. I simply don’t find a solution (if any exists) for that specific problem.

Michelle:  i.i.d. just means that each proband appears repeatedly in the data (6 times in the example), so the dependent variable (DV) and independent variables (IV1 to IV3) are not independently and identically distributed random variables (this would require that each line in the example data is from a different proband).

David: Scale levels according to SPSS standards

age: metric
age: nominal
DV, IV1 to IV3: metric

-> age shall be considered N~distributed, also DV, IV1 to IV3.

Any idea and/or syntax appreciated.

Frank