meaninterval.quad {CTFS} | R Documentation

## Mean Interval Between Census for Quadrates

### Description

Computes the mean time between censuses (in years) for any user specified size quadrate (area) of plot. The user can also specify any portion of the plot (or all of it) be considered. The default quadrate size is 1 hectare.

### Usage

    meaninterval.quad(census1, census2, mindbh = 10,
            plotdim = c(1000, 500), gridsize = 100,
            xrange = c(0, plotdim[1]), yrange = c(0, plotdim[2]),
            whichcensus = "both")

### Arguments

`census1` | name of census datafile for first census, must be a dataframe, must be of same length as `census2`
`census2` | name of census datafile for second census, must be a dataframe, must be of same length as `census1`
`mindbh` | Minimum DBH for computing population size in each census
`plotdim` | dimensions of the plot: east-west 1000m and north-south 500m
`gridsize` | side of the square quadrate, 100 x 100m (1 ha) by default
`xrange` | the x axis of the plot used for computation, standard plot has 0-1000
`yrange` | the y axis of the plot used for computation, standard plot has 0-500
`whichcensus` | variable to indicate which census(es) are to be used. Values are “first”, “second”, “both”

### Details

This is a generic function for any computation of dynamics. Any tree with a recorded date of when a census was done is used in this computation. This function is NOT used for the computation of mean time between censuses for the dynamic functions.

A tree is included in the computation depending upon the value of `whichcensus`. It must have a dbh which equals or exceed `mindbh` for the census specified. For “both” a tree is included if its dbh exceeds `mindbh` for EITHER census.

### Value

`meaninterval.quad` returns a matrix of the mean interval, in years, for species by user defined quadrate.

`$meantime` | mean time between intervals for all trees in quadrate

### Author(s)

Rick Condit and Pamela Hall

### See Also

### Examples

    ## Not run:
    1. Default use of meaninterval.quad
    meantime.both.out <- meaninterval.quad(tst.bci90.full, tst.bci95.full)
    ## End(Not run)

[Package CTFS version 1.00 Index]