itemps: Functions to plot summary information about the sampled...

Description Usage Arguments Details Value Author(s) References See Also

Description

Functions for making barplots summarizing the progress of importance tempering. The itemps.barplot function can be used to make a histogram of the inverse temperatures visited in the trans-temporal Markov chain. The hist2bar function is useful for making a histogram of integer-valued samples (e.g., tree heights) encountered in one or several Markov chains

Usage

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itemps.barplot(obj, main = NULL, xlab = "itemps", 
               ylab = "counts", plot.it = TRUE, ...)
hist2bar(x)

Arguments

obj

"tgp"-class object

main

Main plot label to be augmented by itemps.barplot

xlab

Label for the x-axis

ylab

Label for the y-axis

plot.it

whether to plot the barplot in addition to returning the data.frame for later use in a barplot call

...

other arguments passed to barplot if plot.it = TRUE

x

matrix of integers whose columns are treated as different realizations of similar processes producing where each row represents a sample (e.g., tree height) under that process

Details

itemps.barplot specifically works with the $trace field of a "tgp"-class object. An error will be produced if this field is NULL, i.e., if the b* function used the create the object was not run with the argument trace=TRUE

The hist2bar function can be used on any integer (or discrete) valued matrix. The columns are interpreted as different realizations of similar processes for comparison with one another via a histogram.

The histogram is obtained with the barplot command used with the argument beside=TRUE. See the examples section of default.itemps

Value

Both functions return a data.frame that can be used within the barplot function with argument beside=TRUE

Author(s)

Robert B. Gramacy, rbgramacy@chicagobooth.edu, and Matt Taddy, taddy@chicagobooth.edu

References

Gramacy, R.B., Samworth, R.J., and King, R. (2007) Importance Tempering. ArXiv article 0707.4242 http://arxiv.org/abs/0707.4242

http://bobby.gramacy.com/r_packages/tgp

See Also

default.itemps, vignette(tgp2), barplot



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