[R] Problem with predict?

Hello, I am trying to fit a model to some "death over time" data that does not fit the criteria for the usual LD50 type models (the counts are too large). I am using a simple linear model in an attempt to plot a nice line on a scatter plot and calculate some LD values to use in designing an exp

[R] Changing strip text

I'm trying to create a 5-panel xyplot with each strip labelled by treatment. The code is as follows: xyplot(log(pfuml)~Transfer|Treat,groups=Pop,ylab="Log10 Pfu/ml",as.table=T, type="a", auto.key= list(space="right",points=F,lines=T)) I've tried: