path analysis and diagram (structural model)

[Kristi Glover]

Hi R- USER,
I have been struggling to compute path analysis in R. I installed package "sem" and I tried to run the analysis but could not get a diagram.

I have very big data set, here I just copied a sample of my data and I wanted to see how I can do the path analysis and get the patch diagram (with r2 in each path).

I have two tables;  1: num. of species - which is the depended variable and 2. env is the independent(predictors)  variable.

I was trying to do multiple regression (num. of species vs env) and trying to see the path diagram (structural model). But I could not do it.

would you help me on how I can perform the analysis and show in diagram of the model?

dput(env)
structure(list(preci = c(45.145, 38.501, 32.631, 38.392, 44.807,
45.774, 46.917, 44.384), wind = c(90L, 113L, 127L, 63L, 54L,
43L, 31L, 38L), radiation = c(11.805, 18.31, 19.381, 13.154,
9.752, 7.075, 5.558, 7.616), temp = c(12L, 15L, 21L, 20L, 14L,
18L, 21L, 18L)), .Names = c("preci", "wind", "radiation", "temp"
), class = "data.frame", row.names = c(NA, -8L))

dput(num.of.species)
structure(list(S = c(4L, 7L, 9L, 10L, 10L, 8L, 8L, 1L)), .Names = "S", class = "data.frame", row.names = c(NA,
-8L))

Sincerely,

Kristi

     
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