CODEWITHSUNDEEP
rstatistics
temsandroses
temsandroses

Reputation: 321

How to find correlation coefficients for non-numeric variables

Species     Gender     Weight     Corneal Diameter Avg
Great Grey    M         971            19.5
Great Grey    F         1209           19.0
Great Grey    M         952            20.5
Great Grey    F         1793           20.5
Snowy         M         1658           22.0
Snowy         F         1899           22.75
Snowy         F         1975           24.50
Snowy         M         1646           23.00

Okay so I have this data set. I want to see if there is a correlation between Male Corneal Diameter Average vs. Female Corneal Diameter Average. I'm not sure how I would do this in R. I tried to create a subset for males and females and then use cor(x, y) to get the correlation coefficient but it's not working. Any help would be appreciated!

Upvotes: 3

Views: 8453

Answers (1)

G. Grothendieck
G. Grothendieck

Reputation: 269501

Use Spearman rank correlation. If x and y are the two vectors which may or may not be numeric.

cor(rank(x), rank(y))

Upvotes: 3

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