Variables

Variables

1. to test hypotheses

   • measure variables
     • two kinds of variables
       • a proposed cause
       • a proposed outcome

2. Independent variable

   • we think is a cause
   • is a predictor

3. Dependent variable

   • we think is an effect
   • is an outcome

4. Levels of measurement

   • variables can be
     • categorical
       • binary variable
         • two distinct types of things
           • responding yes or no
       • nominal variable
         • more than two categories
       • ordinal variable
         • categories have logical order
     • continuous
       • interval variable
       • ratio variable

5. measure error

   • vality
   • reliability