At 23:12 26/11/2006, Tim Sippel wrote: >Hi- > >I'm wrestling with some of my data apparently not being called into a GLM or >an LM. I'm looking at factors affecting fish annual catch rates (ie. CPUE) >over 30 years. Two of the factors I'm using are sea surface temperature and >sea surface temperature anomaly. A small sample of my data is below: > >
I could not make much sense of the dataset and your output is incomplete (what happened to Year?) but usually the message you received means that one of your predictors is a linear combination of some of the others. >CPUE > >Year > >Vessel_ID > >Base_Port > >Boat_Lgth > >Planing > >SST > >Anomaly > > >0.127 > >1976 > >2 > >BOI > >40 > >Planing > >19.4 > >-0.308 > > >0.059 > >1976 > >30 > >BOI > >40 > >Displacement > >19.4 > >-0.308 > > >0.033333 > >1977 > >46 > >BOI > >45 > >Displacement > >18.5 > >-1.008 > > >0.169231 > >1977 > >2 > >BOI > >40 > >Planing > >18.5 > >-1.008 > > >0.044118 > >1977 > >19 > >BOI > >34 > >Planing > >18.5 > >-1.008 > > >0.114286 > >1977 > >29 > >WHANGAROA > >42 > >Displacement > >18.5 > >-1.008 > > > >Have defined Year, Vessel_ID, Base_Port, Boat_Lgth, Planing as factors, and >CPUE, SST, Anomaly are continuous variables. > > > >The formula I'm calling is: glm(formula = log(CPUE) ~ Year + Vessel_ID + >SST, data = marlin). A summary of the glm includes the following output: > > > >Coefficients: (1 not defined because of singularities) > > Estimate Std. Error t value Pr(>|t|) > >Vessel_ID80 -0.54093 0.23380 -2.314 0.021373 * > >Vessel_ID83 -0.36499 0.20844 -1.751 0.080977 . > >Vessel_ID84 -0.23386 0.19098 -1.225 0.221718 > >SST NA NA NA NA > > > >Can someone explain the output "Coefficients: (1 not defined because of >singularities)"? What does this mean? I'm guessing that something to do >with my SST data is causing a "singularity" but I don't know where to go >from there? Have inspected various R discussions on this, but I haven't >found the information I need. > > > >Many thanks, > > > >Tim Sippel (MSc) > >School of Biological Sciences > >Auckland University > >Private Bag 92019 > >Auckland 1020 > >New Zealand > >+64-9-373-7599 ext. 84589 (work) > >+64-9-373-7668 (Fax) > >+64-21-593-001 (mobile) > > > > > [[alternative HTML version deleted]] Michael Dewey http://www.aghmed.fsnet.co.uk ______________________________________________ R-help@stat.math.ethz.ch 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.
