Cornell University Ergonomics Web

CUErgo Statistics Helper: Correlation Statistics

What type of data do you want to analyze?
Nominal      Ordinal      Interval or Ratio

• A 2 x 2 contingency table

ORDINAL DATA (e.g. rank data, rating scales with unequal intervals, such as a scale like " poor", "fair", "good").

How did you test your subjects?

• Independent groups (i.e. each subject participated in a different treatment condition)
• Repeated measures (i.e. each subject participated in a more than one treatment condition so that repeated measurements were taken for that subject)

INTERVAL or RATIO DATA (e.g. equal interval rating scale, such as a Likert scale, measures, such as inches, degrees etc.) or ratio data (e.g. miles per hour, meters per second).

How did you test your subjects?

• Independent groups (i.e. each subject participated in a different treatment condition) for 2 conditions
• Repeated measures (i.e. each subject participated in a more than one treatment condition so that repeated measurements were taken for that subject) for 2 conditions
• Independent groups or repeated measures for 3 + conditions
• I want to fit a curve or predict a trend

Use WebStat for Data Analysis

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