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...like: Year Week A B 1982 1 11.3 198.53 1982 2 14.4 309.00 1982 3 23.2 325.49 When i tried to run glm on just the first entry using [1,] i got the error: Error in nmod2$R4.2w[1, ] : incorrect number of dimensions My edited code for glm is: abundmod1<-glm(R4.2w~N_4,data=nmod1[1:2,]) Does this code still just use the information from the first week? Also since I have to run it for more than 10 years worth of data for 15 weeks, is there a faster way? Thank you so much in advance! Mansi -- View this message in context: http://r.789695.n4.nabble.com/GLM-Modelling-hel...