Thanks for making it quickly reproducible - I was able to see that message in English within a few seconds. The start has x=86, but the data is also called x. Remove x=86 from start and you get a different error. P.S. - please do include the R version information. It saves time for us, and we like it if you save us time.
"vincent laperriere" <vincent_laperri...@yahoo.fr> wrote in message news:883644.16455...@web24106.mail.ird.yahoo.com... Hi all, I would like to fit a gamma pdf to my data using the method of RSS (Residual Sum-of-Squares). Here are the data: x <- c(86, 90, 94, 98, 102, 106, 110, 114, 118, 122, 126, 130, 134, 138, 142, 146, 150, 154, 158, 162, 166, 170, 174) y <- c(2, 5, 10, 17, 26, 60, 94, 128, 137, 128, 77, 68, 65, 60, 51, 26, 17, 9, 5, 2, 3, 7, 3) I have typed the following code, using nls method: fit <- nls(y ~ (1/((s^a)*gamma(a))*x^(a-1)*exp(-x/s)), start = c(s=3, a=75, x=86)) But I have the following message error (sorry, this is in German): Fehler in qr(.swts * attr(rhs, "gradient")) : Dimensionen [Produkt 3] passen nicht zur Länge des Objektes [23] Zusätzlich: Warnmeldung: In .swts * attr(rhs, "gradient") : Länge des längeren Objektes ist kein Vielfaches der Länge des kürzeren Objektes Could anyone help me with the code? I would greatly appreciate it. Sincerely yours, Vincent Laperrière. [[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.
