abundance.change.calculation {CTFS} | R Documentation

## Calculation of Annual Change in Population Size and Probability that Population Size has Changed

### Description

Computes annual change in population size (rate) and probability that that rate is = 0 (prob) for values provided. It is called from `abundance.change` but can also be used independently with scalar, vector or 2 dimensional arrays.

### Usage

    abundance.change.calculation(N0 = N0, N1 = N1, S = S, meantimeint = meantimeint)

### Arguments

`N0` | abundance in first census
`N1` | abundance in second census
`S` | number of surviors from first census
`meantimeint` | mean number of years between census for trees used in abundance change computation

### Details

See `CTFS.abundance` for details on the computation of abundance and associated functions.

If arguments are not arrays, they are coerced into arrays and any names associated with their dimensions are retained. This appears to be quite robust regardless of the object form of the arguments. But if problems asired, then make arguments into arrays with dimnames. Alternatively, call this from this from `abundance.change`.

### Value

Returns a list of:

`rate` | annual rate of change in abundance
`prob` | probability that N0 == N1

### Author(s)

Rick Condit, Suzanne Lao, Pamela Hall

### See Also

`CTFS.abundance`, `abundance.change`

### Examples

    ## Not run:
    1.  use with scalar
    abundance.change.calculation(500,510,490,5)

    2.  use with vectors that have no names associated
    N0 <- seq(100,1000,by=100)
    N1 <- seq(110,1100,by=100)
    S <- seq(90,990,by=100)
    meantimeint <- rep(5,10)

    ## End(Not run)

[Package CTFS version 1.00 Index]