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!