How many variables do you want to predict (i.e. how many dependent variables do you have)?
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More Information (if you need help deciding)
How many dependent variables do you have?
One Dependent Variable: This means that you are predicting only one outcome variable. For instance, using student IQ to predict student performance in math classes.
Two or More Dependent Variables: This means that you are trying to predict two or more variables simultaneously. For instance, using student IQ to predict grades in school for multiple subjects (Math and History, English, etc).