I would like to run a factor analysis with SPSS but I have doubts about the structure that my database has to have.
We have collected information about the two favorite food of different groups of people with eating disorders. The objective is to know if using the nutritional profile we are able to relate some type of specific food (for example high in fat, sugar and low in protein) with some group of eating disorders.
We have done a nutritional profile about micro and macronutrients on each of the two foods separately. On the database, we have one row per participant and different columns where, for example, we have food hydrates 1, food hydrates 2, food proteins 1, food proteins 2... Would it be the correct form of the database for factor analysis? Or because it is the same item - for example, hydrates - would it be more appropriate to do the sum or the average of the two hydrates and thus have only a single column about hydrates?
Thank you!
The basic assumption of factor analysis is that for a collection of observed variables there are a set of underlying variables called factors (smaller than the observed variables), that can explain the interrelationships among those variables.
I know the assumptions but I need to know if I can use the same variable (i.e protein1 and protein2) related to two different food or If I had to sum or to calculate the medium of the protein to avoid the repetition of the variable.
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