By definition, multicollinearity arises when the predictor variables are strong correlated among themselves. In such a case, multicollniearity inflates the errors. Why don't you examine the correlation matrix of predictor variables if they are measured in continuous scales and see whether their correlation coefficients are way too high. The problem of multicollniearity might arises when r is greater than .80 (this is a rule of thumb, just for guidance). Because parsimony is praised in reductionist science, the number of predictors can be reduced if they are substantially correlated among themselves.

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- You can use the linear regression procedure for this purpose. Multicollinearity statistics in regression concern the relationships among the predictors, ignoring the dependent variable. So, you can run REGRESSION with the same list of predictors and dependent variable.
- If you have categorical predictors in your model, you will need to transform these to sets of dummy variables to run collinearity analysis in REGRESSION.

Before analyzing any set of variables in a linear model, including ordinal regression, begin by check for multicollinearity by using linear regression to check the model Y= B0 + B1X1 + B2X2 + B3X + ... + e.
In SAS, this can be done with Proc Reg with the /VIF option on the model statement. Even if Y is binary, the linear regression procedure can be used to check for multicollinearity. Just use the linear regression procedure to screen for multicollinearity. Do your actual analysis with a logistic regression procedure.

The general guideline is that VIF values under 10 indicate that multicollinearity is not a problem. If you get high VIF values, then you will have to re-code your variables, do principle components analysis, or drop a variable.

Run a principal components analysis in SPSS on your independent variables. One of the options should be to use multiple R-square for the initial communalities. SPSS will then print those out. Since 1 – R-square is the tolerance, very large communalities indicate multicollinearity.

For categorical variables as predictors you can run a Spearman's correlation in SPSS using different combinations. Similar to linear regression, an r of .8 or greater suggests collinearity.

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