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..... please help me to get around this problem. Thanks in advance. Location Dist. Size low1 .5 10.5 low2 .5 23 low3 .5 NA low4 .5 NA mid1 3 15 mid2 3 11.5 mid3 3 15 mid4 3 NA high1 6 12.5 high2 6 20 high3 6 21 high4 6 22 wall1 10 13 wall2 10 12.5 wall3 10 13 wall4 10 12 d<-read.table("dilomaaethiops.txt",header=T) d str(d) range(d$Dist.) s<-d$Size range(s) s[s<.1]<-NA range(s,na.rm=T) summary(d) length(s) length(d$Dist.) plot(s~d$Dist.,xlab="Distance from Shoreline (m)",ylab="D. aethiops Size (mm)", pch=7) a1<-glm(s~d$Dist.,family="quasipoisson",...