cat1 cat2 cat3 cat4 topic1 1 1 1 1 topic2 1 0 1 1 topic3 1 0 1 1 topic4 1 0 1 0
This data table means: When a topic belongs to category, the data entry will be 1. If the topic doesn't belong to certain category, then the data entry will be 0.
What kind of level measurement is this? Ordinal scale, nominal scale, ratio scale, or interval scale?
Thank You