strata.tool {stratification}

Functions to Visualize Stratified Designs

Description

print.strata prints a "strata" object, presenting the stratification information into a table.

plot.strata produces a histogram of the stratification variable X, in which the stratification boundaries are drawn. A table with the Nh and nh values is also added at the top of the plot.

Usage

## S3 method for class 'strata'
print(x, ...)

## S3 method for class 'strata'
plot(x, logscale = FALSE, drop = 0, main = 
   paste("Graphical Representation of the Stratified Design", xname), 
   xlab, ...)

Arguments

x

An object of class "strata" to print or to plot.

logscale

A logical indicating whether the X axis should be represented on the log scale or not. The default is FALSE.

drop

A integer indicating how many of the largest values of X should be omitted in the plot. This argument is useful when some large values of X stretch the X range too much.

main

A character string giving the title of the plot.

xlab

A character string naming the X axis.

...

Additional arguments affecting the print or the plot produced.

Note

When the object of class "strata" contains a certainty stratum, plot.strata removes from the data the units in this stratum before generating the histogram.

Author(s)

Sophie Baillargeon [e-mail] and
Louis-Paul Rivest [e-mail]

References

Baillargeon, S. and Rivest L.-P. (2011). The construction of stratified designs in R with the package stratification. Survey Methodology, 37(1), 53-65.

See Also

strata.bh, strata.cumrootf, strata.geo, strata.LH

Examples

cumrootf <- strata.cumrootf(x=MRTS, CV=0.01, Ls=4, alloc=c(0.5,0,0.5), nclass=500)
print(cumrootf)
plot(cumrootf)
plot(cumrootf, drop=5)
plot(cumrootf, logscale=TRUE)
geo <- strata.geo(x=MRTS, CV=0.01, Ls=4, alloc=c(0.5,0,0.5))
print(geo)
plot(geo, logscale=TRUE)
# The geometric method does not perform well because of some small units
LH <- strata.LH(x=MRTS, CV=0.01, Ls=4, alloc=c(0.5,0,0.5), takeall=1)
print(LH)
plot(LH, logscale=TRUE)