Irfan Ahmed, PhD

Performing a MANOVA using interactive mode You can use the interactive mode of SPSS to perform a MANOVA if all of your independent variables are manipulated between subjects. To peform a MANOVA using the interactive mode in SPSS • Choose Analyze thenGoto General Linear Model thenGoto Multivariate . • Move the DVs you want to examine to the Dependent Variables box. • Move any categorical IVs to the Fixed Factor(s) box. • Move any continuous IVs to the Covariate(s) box. • By default, SPSS will build a model including all interactions between the categorical independent variables, but no interactions with the continuous independent variables. To analyze a different model you must take the following steps. o Click the Model button. o Click the radio button next to Custom . o Add all of main effects to your model by clicking the IVs in the box labeled Factors and Covariates , setting the pull-down menu to Main effects , and clicking the arrow button. o Add each of the interaction terms t...

MANOVA (multivariate analysis of variance) is a statistical procedure that allows you to determine if a set of categorical predictor variables can explain the variability in a set of continuous response variables. It is also possible to include continuous predictor variables either as covariates or as true independent variables in the design (so that you can test for the effect of interactions). MANOVA is related to within-subject ANOVA in that both of these analyses examine multiple measurements from each case (i.e., participant) in your data set. Whether you should perform a MANOVA or a within-subject ANOVA depends on the relationship between the measurements. If the different measurements reflect observations at different levels of a theoretical factor, then you should perform a within-subject ANOVA. For example, you might look at a person’s heart rate over successive days, such that the different measurements represent different levels of a "time" factor. If the me...