Hair and Psychology
Hair Color and Eye Color
The tables reveal a clear co-relation between hair color and eye color.
The columns "blue" and "brown" are of particular interest: The proportion of blue eyes is continuously decreasing from light blond across medium blond, dark blond, light brown, medium brown, dark brown to black. And the proportion of brown eyes is continuously increasing in the same order. This pattern holds for males and females.
It should be noted that the data were procured from an online survey, and they are not based on a representative sample of the German population.
Interestingly, our data are fully in line with Malloy's observation: "...consistent with Razib's previous look at published data from Iceland and the Netherlands, blue eyes are more common in men than in women. Also like the European data, green eyes are more common in women" (see: NLSY blogging: Eye and hair color of Americans posted by Jason Malloy)
Detailed results of this study will be reported elsewhere.
Note: Here you find additional data on samples from Northern Germany, Central Germany, Southern Germay, Austria, and Switzerland
I would appreciate any hints on statistical data on frequencies of hair colors and eye colors!