```Date: Mon, 21 Aug 2006 13:05:17 -0300 Reply-To: Hector Maletta Sender: "SPSSX(r) Discussion" From: Hector Maletta Subject: Re: Relationship between Sets of Dependent and Independent Variables Comments: To: "Susan M. Sereika" In-Reply-To: <000d01c6c527\$ea174db0\$34228e88@CURLY> Content-Type: text/plain; charset="US-ASCII" You state your friend's goals in a very sketchy way, so it is very difficult to give an opinion. For instance, how many variables are involved? 200 cases may be way too few if the variables happen to be (even moderately) numerous. Is he/she interested in bivariate or multivariate relations between these variables? For instance, one may be interested in crossing pairs of variables such as X BY Z BY sex, and see whether the association/correlation of X and Z varies with sex, and this may be feasible with 200 cases (140 women, 60 men), only if one has, say, K variables there would be K*(K-1)/2 pairs of variables, which rapidly goes into the hundreds or the thousands as K grows. For K=50, there are 1225 pairs of variables to consider. If one is interested in models involving many variables, such as regression, the number of possible models grows exponentially and, besides, the small number of cases in the sample becomes rapidly a limitation. Another consideration is whether your friend has any theory or conceptual approach or problem-oriented goal when facing these data, or is just exploring blindly around. What is he/she looking for? Just mining around for any kind of non-random-looking patterns, like an astronomer searching for signs of extra-terrestrial intelligence among random electromagnetic cosmic noise, or like John Nash, he of the beautiful mind, parsing newspapers in the worst of his madness? In a sample of 200 she/he may find many promising patterns, but they may be nothing but sample flukes. Hector -----Mensaje original----- De: SPSSX(r) Discussion [mailto:SPSSX-L@LISTSERV.UGA.EDU] En nombre de Susan M. Sereika Enviado el: Monday, August 21, 2006 10:44 AM Para: SPSSX-L@LISTSERV.UGA.EDU Asunto: Relationship between Sets of Dependent and Independent Variables Dear Listserv members: A colleague is interested in examining the relationship between two sets of variables (dependent variables and independent variables). Additionally she would like to investigate whether the relationship varies between men and women. The total sample size is somewhat moderate (about 200 participants) with 70% being women. What might be a good approach to use when analyze these data in light of the objectives? Any suggestions are most appreciated. Sincerely, Susan Sereika ```

Back to: Top of message | Previous page | Main SPSSX-L page