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studysites
2008 Mar 09
1
sampsize in Random Forests
Hi all,
I have a dataset where each point is assigned to a class A, B, C, or
D. Each point is also assigned to a study site. Each study site is
coded with a number ranging between 1-100. This information is stored
in the vector studySites.
I want to run randomForests using stratified sampling, so I chose the option
strata = factor(studySites)
But I am not sure how to control the number of samples taken from each
study site. I tried to use 10 points from each study site:
mySampSize = rep(10, 100)
So my function call looks like:
R...
2010 Jul 15
0
Histogram with two groups on the same graph (not on separate panels)
...edited>
231 47.6
235 NA
238 50.3
241 50.5
243 62.8
244 59.0
FYI: The structure of my dataset, gb looks like:
> str(gb)
'data.frame': 308 obs. of 43 variables:
$ id : Factor w/ 290 levels "(023.541.040) G7",..: 241 244 243 245
278 193 194 195 196 197 ...
$ studysite : Factor w/ 29 levels "Assabu","Astushinai",..: 20 19 19 19 19
29 29 29 29 29 ...
$ studysitecode: int NA NA NA NA NA 7 7 7 7 7 ...
$ subsite : int NA NA NA NA NA 18 18 18 18 18 ...
$ sitecond : int NA NA NA NA NA 1 1 1 1 1 ...
$ Habitat : Factor w/ 6 le...