hie carried out a comparison of survival curves using the log rank test in R with the values of rho ranging from -2 to 2 in  increments of 0.5 the question is at rho=-1.5 the power of the test seems to fluctuate or differ from the trend shown by the other values of rho is the statistical reason for this difference.ie if the power is increasing as i move from 0 to -2 at rho=-1.5 the power either greatly increases/decreases then at rho = -2 it follows the general trend 

if any one can help then thanks although this might not be an R question.
I

       
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