Hi, thank you for your rapid answer. The problem is solved. My second and last question is as follows: I use the yield curve package and I want to calculate the fitted yields via the Svensson approach. The I have already calculated the six required parameters. At first I read them in from a CSV-file. NSSParameter<-(read.csv("C:/Users/admin/Desktop/Universit?t/SeminarinFinance/R/ParameterSvensson.csv",sep=";",dec=".",header=TRUE) Now I want to plug them in in the function. Srates(NSSParameter,maturity,whichRate = "Spot"). NSSParameter is defined as mentioned above looks like for 500 values: beta_0 beta_1 beta_2 beta_3 tau1 tau2 1 3.824276 -3.726540 -1.878026723 -3.856153 1.1617407 1.672910 2 3.786777 -3.688137 -1.929259408 -3.780010 1.1617407 1.672910 Maturity is maturity<-c(1/12,3/12,6/12,1,2,3,5,7,10,20,30). Spot is the sort of interest rate I want to determine. The error request I receive now is: Error in hasTsp(x) : invalid time series parameters specified. How fix this concrete case? I have not found an example to that. Best Regards Jonas