Register to reply 
Kolmogorov smirnov in r  cannot compute correct pvalues with ties 
Share this thread: 
#1
Jan1813, 10:13 AM

P: 13

Hi,
I'm trying to use the kolmogorov smirnov test in in R to compare one distribution with another. I'm getting the following error: cannot compute correct pvalues with ties I think this is because the dataset that I am using has in the first instance around 2000 values, and the second, 50000 values. A number of these are inherently going to be replicates of another number in the series (i.e. "ties"). I'm just wondering if this has implcations for the p value I have? Is the p value valid? Cheers all 


#2
Jan1913, 11:34 AM

Sci Advisor
P: 3,247

Did you read the R documentation for the ks.test function?
You could test the sensitivity of the pvalue empirically. Add small random perturbations to your data to generate new data sets that have more digits. See how much the p value changes. 


Register to reply 
Related Discussions  
KolmogorovSmirnov and Pvalue  Set Theory, Logic, Probability, Statistics  11  
Math to compute width of gaussian PDF(x) given sigma & N values of random variable x  Set Theory, Logic, Probability, Statistics  10  
Question about the NagataSmirnov metrization theorem  Differential Geometry  11  
Broken ties  General Discussion  14  
KolmogorvSmirnov goodness of fit test  Calculus & Beyond Homework  2 