[NMusers] Combined residual model - reporting of sigma and sigma squared

(thus replacing the epsilons), does it return the standard deviation, whereas when using epsilons it returns the variance? What algorithm is it using to obtain each? Once again, thanks for any help. Best, Paul Westwood. On Feb 15 2008, Ribbing, Jakob wrote: Thank you all

[NMusers] Combined residual model and IWRES.

and finally, which model should i use? Thankyou in advance for any light that can be shed. Best, Paul Westwood.