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Starting your analysis

Planning the analysis for a research project for the first time can be a little overwhelming. To help you with this we compiled a short guide for the first steps in picking the appropriate analysis for your research question and data. Please try to go through these steps before you come to the methodology shop. Should you experience any difficulties while doing so, we are more than happy to help.

  1. Identify your research question and/or specific hypotheses.

  2. Identify the dependent variable(s) (what do you want to predict?)

  3. Identify the independent variable(s) (what are your predictors?).

  4. Determine the levels at which your variables are measured (are the variables categorical or continuous?) and whether your variables are measured once or repeatedly.

  5. Pick an analysis according to the information below.


Independent variables (x)

1 independent variable

more than 1

Categorical

Continuous

Categorical

Continuous

Dependent variable (y)

Categorical

Chi² test

Logistic regression

Continuous

One-way ANOVA

Simple linear regression

Two-way ANOVA

Multiple linear regression

With more than one dependent variable in the same analysis, multivariate models (e.g. MAN(C)OVA) are needed.
If your dependent variable is measured repeatedly, either a paired t-test (2 measurements) or a repeated measures ANOVA (more than 2 measurements) is appropriate.

Testing assumptions

Generally, assumptions (e.g. normality) are tested on the residuals of your (already calculated) model, not on the dependent variable.

On the internet, you can find many p-value based tests to check if the assumptions of your analysis are met (e.g. the Shapiro-Wilks test). We would not recommend using these as your main assumption checks, because of the drawbacks from NHST. A more informative way to check your assumptions is plotting (e.g. Q-Q plots and plots of residuals versus predicted values).

Useful resources

Step-by-step SPSS tutorials and basic analysis guides:

For a recap of the basics:

For mediation and moderation analysis:

Last modified:31 March 2020 11.29 a.m.
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