Hello,

My name is Craig and I need help plotting a "line" for a multiple linear
regression in R.

Here is my sample data (filename:  convis.txt)

Output of convis.txt is (vis and density being predictors of either
avoidance or entrance):

   vis den  avoid entrance
1   10   1 0.0000   0.0000
2   10   3 0.8750   0.0000
3    8   3 0.8180   0.0300
4    8   3 0.6670   0.0667
5    8   1 0.2110   0.0000
6    6   1 0.2500   0.0000
7   10   1 0.3000   0.0000
8   10   1 0.1050   0.0000
9    8   1 0.7000   0.1000
10   3   5 0.1176   0.0588
11   3   5 0.3077   0.1150
12   3   9 0.9090   0.0900
13   3   7 0.7778   0.1110
14   3   5 0.5560   0.1110
15   3   1 0.5710   0.0000
16   3   4 0.5710   0.0000

In order to do the multiple regression, I used the following coding:


double=read.table("convis.txt",header=TRUE)
attach(double)
double
stem(vis)
stem(den)
stem(avoid)
stem(entrance)
plot(entrance,vis*den)      *as means to see how the interaction between
visibility and density may impact entrance behaviors
model6=lm(entrance~vis*den)
model6
summary(model6)
*abline(model6)      *Here is the issue as I used this for my simple linear
regression technique, but do not know what to use for a multiple regression*

If anybody can provide some feedback on this, it would be greatly
appreciated.

Kind Regards,

Craig

-- 
<><  <><  <><
Craig O'Connell
University of Massachusetts Dartmouth
Marine Biologist
www.youtube.com/craigpoconnell
craigosea.blogspot.com

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