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24444
2010 Jan 06
0
Unconsistent behaviour of function cor()
...() in R-2.10.1-64bit-Unix
In a dataset with 1366 patients and 244 clinical variables Spearman's Rho
was calculated for some fatty acids and BMI and came over something rather
odd:
R seems to calculate Rho differently on 2.10.1-64bit-Unix and
2.9.0-32bit-Windows when I calculate the complete (244x244) correlation
matrix and then pick out the values I am interested in!
The 2.9.0-32bit-Windows version calculates the Rho for pairwise complete
observations as I expected but not so did 2.10.1-64bit-Unix.
I compared 4 ways of producing the Rho:
A) calculating the rho for each pair of variables i...