Hi all, Has anyone used the qua.regressCOP2 function from the copBasic package??? The default copula function used in this function is plackett copula and I wanted to use archimedean copula. Attached below is my code:
mycop<-frankCopula V=seq(0.001,0.99,by=0.000217) R<-qua.regressCOP2(0.25,V,cop=mycop,para=c(3.504)) And this is the error I get: Warning messages: 1: In qua.regressCOP2(0.25, V, cop = mycop, para = c(3.504)) : could not uniroot in derCOPinv2, skipping sample for i=4558 having V=0.989869 2: In qua.regressCOP2(0.25, V, cop = mycop, para = c(3.504)) : 3.504 Would really appreciate if anyone could tell me what is causing the problem and how I should solve it. indu [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.