search for: sycamore

...mon species), or tree dbh has a significant influence on the number of vines per tree. When I attempted to use the zicounts function, R gave me the following error message: > vines.zip<-zicounts(resp=Total.vines~.,x=~Site+Species+DBH,z=~Site +Species+DBH,distrname="ZIP",data=sycamores.1) Error in ifelse(y == 0, 1, y/mu) : dim<- : dims [product 12] do not match the length of object [549] In addition: Warning messages: 1: longer object length is not a multiple of shorter object length in: x[good, ] * w 2: longer object length is not a multiple of shorter object length in:...

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...ly taken to be 1) Null deviance: 1972.3 on 544 degrees of freedom Residual deviance: 1290.0 on 537 degrees of freedom AIC: 1796.0 Number of Fisher Scoring iterations: 6 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% Call: glm(formula = Total.vines ~ Site * Species + DBH, family = poisson, data = sycamores.1) Deviance Residuals: Min 1Q Median 3Q Max -4.9815 -1.2370 -0.6339 -0.3403 6.5664 Coefficients: (3 not defined because of singularities) Estimate Std. Error z value Pr(>|z|) (Intercept) -2.788243 0.303064 -9.200...

I want to add a line that represents the relationship between x and y to a strip chart, I've tried the following functions: par(new=TRUE) points(x,y) lines(x,y) but nothing works, I get the strip chart but line doesn't show up. Here is my function: stripchart(hydfin$exp ~ hydfin$alt, vert = TRUE, pch = 1, method = "jitter", jit = 0.05, xlab = "Elevation", ylab =