Suppose I collect a lot of data from a group of persons, like
- their height
- their weight
- color of eyes (chosen from eg the four categories blue/brown/black/other)
- day of the week the measurement was done
and I want to find which of the above data correlates with height.
For weight, I can image how that goes: just make the (x,y) set and measure stuff like Pearson's correlation. But I get stuck for things like 'colors of eyes' where there's no natural way to order them, or binary data like sex. Also for day of the week (where I'd like to find no correlation at all) but I wouldn't know how to order them.
How do I do this?