Displaying 3 results from an estimated 3 matches for "parea".
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2005 May 04
1
stratified bootstrap with boot
Hello,
I am new to R, and am having trouble getting the output I want from a
stratified bootstrap. I didn't recieve a reply the first time I posted
this question so I have tried to make it more clear. My data frame
(denboot) is set up as follows:
SITE cswa parea treat
1 BeanA 3 1.20 m
2 BeanBC 3 1.05 m
3 BeanD 1 0.93 m
4 BlackB 1 1.01 m
5 Brooks 3 4.00 b
6 BullL 3 1.32 b
7 BullM 1 0.20 m
8 BullU 4 2.06 b
...
#Here is my code:
cswafun <- function(denboo...
2005 Apr 29
0
problem with strata in boot
...d as burned or mowed and
for each of these two strata I would like to determine the precision
of an overall density estimate. I can run an unstratified bootstrap
without problem, but when I specify the strata I get the same
unstratified result.
cswafun <- function(denboot, i) sum(cswa[i])/(sum(parea[i])
attach(denboot)
cswa.boot <- boot(denboot, cswafun, R = 10000, strata = treat)
###
cswa is a vector of integers representing the number of pairs/site
parea is a numeric vector of the size of each study site
treat is a character vector of 'b's and 'm's. I have also coded this...
2004 Sep 22
2
dot density maps
Dear All,
In the moment i'm using the map and maptools package to read shapefiles
and display the maps.
I'm looking for the possibility to draw points (randomly positioned or
positioned according to a grid) into the polygons instead of filling the
polygons with colors.
For example:
a map (shapefile) with 10 countries, 15 points in the polygon of country
A, 20 points in the