Full_Name: Ian Gregory Version: latest OS: Widnows XP Submission from: (NULL) (58.110.163.199) fSeries is a great package keep it up. Need to update the help page. Type: help(garchOxFit) The line: garchOxFit(formula.mean = ~arma(0,0), formula.var = ~garch(1,1)) Should be changed to: garchOxFit(~garch(1,1),x) ------------------------------------------ eg. The example in the help page reads: Examples ## SOURCE("fSeries1.4D-GarchOxModelling") ## Not run: ## garchOxFit - # Load Benchmark Data Set: data(dem2gbp) x = dem2gbp[, 1] # Fit GARCH(1,1): garchOxFit(formula.mean = ~arma(0,0), formula.var = ~garch(1,1)) ## End(Not run)