fields (version 1.0)

stats.bin: Bins data and finds some summary statistics.

Description

Cuts up a numeric vector based on binning by a covariate and applies the FIELDS/FUNFITS stats function to each group

Usage

stats.bin(x, y, N = 10, breaks = NULL)
{
}
x{
Values to use to decide bin membership
}
y{
A vector of data
}
N{
Number of bins. If the breaks is missing there are N bins equally spaced
on the range of x.
}
breaks{
The bin boundaries. If there are N+1 of these there will be N bins. 
The bin widths can be unequal.
}
A list with several components. stats is a matrix with columns indexing
the bins and
rows being summary statistics found by the stats function. These are:
 number of obs, mean, sd, min, quartiles, max and number of NA's. 
(If there is no data for a given bin, NA's are filled in. )
breaks are the breaks passed to the function and centers are the bin
centers.
bplot, stats
u<- rnorm( 2000)
v<- rnorm( 2000)
x<- u
y<- .7*u + sqrt(1-.7**2)*v
look<- stats.bin( x,y) 
look$stats["Std.Dev.",]
data( ozone2)
# make up a variogram day 16 of Midwest daily ozone ...
look<- vgram( ozone2$lon.lat, c(ozone2$y[16,]), lon.lat=T)
# break points
brk<- seq( 0, 250,,40)
out<-stats.bin( look$d, look$vgram, breaks=brk)
# plot bin means, and some quantiles  Q1, median, Q3
matplot( out$centers, t(out$stats[ c("mean", "median","Q1", "Q3"),]), 
type="l",lty=c(1,2,2,2), col=c(3,4,3,4), ylab="ozone PPB")
univar