Generalised linear model: Point on fitted line

General
1

Hi all,

My code: GLM=glm(Probability ~ Patchsize * Area, family=binomial, data=Data)

I have plotted this using ggplot2, with two fitted lines for Area. Solid line representing one area and dotted line representing another area.

image

I want to determine the probability of encountering invertebrates at a certain point on the fitted lines, as well as the CI.

For example, at a patch size of 768 cm2 what is the probability of encountering invertebrates in each area?

Please help?

2

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