Hello I am trying to analyze some data in SPSS. I am trying to see if my dependent multi level variable age influences my questions eg. if a group age 20-30 a group age 31-40 and a group 41-50 influences a question where I ask what level of pain do you feel from 1-10. Which test do I use. I heard correlation and One-way ANOVA since it is a norminal vs a scale. but isn't correlation for scale vs scale.
Hello dear
I think you shall split age variable in spss software it located in data option in spss you can do this if you split age variable.
You said age was your dependent variable. I seriously doubt that. I think that age is an explanatory variable, and pain is the outcome (dependent) variable. Do you have people's actual ages? If so, I would start by inspecting a scatter-plot with X = Age and Y = Pain score. If the relationship looks linear, fit a linear regression model. Do not needlessly carve age into age groups, as this entails loss of power, and it imposes an artificial step function to the fitted values. I.e., everyone within the same age group has the same fitted value (the group mean), and two people just on opposite sides of an age cut-point can have very different fitted values despite having a tiny age difference. See slides 24 & 25 in the presentation linked below, for example.
HTH.
Presentation Free Advice for Power-Hungry Researchers: Do Not Categorize ...
The three groups of age are independent variable, and the scale of pain is the dependent variable.
you can do ANOVA test.
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