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

View source: R/change_functions.R

`getDeclineStats`

calculates the Proportional Rate of Decline (PRD),
Absolute Rate of Decline (ARD) and Annual Rate of Change (ARC), given two
areas at two points in time. Also provides the total area difference. Inputs
are usually the results from `getArea`

.

1 | ```
getDeclineStats(A.t1, A.t2, year.t1, year.t2, methods)
``` |

`A.t1` |
Area at time t1 |

`A.t2` |
Area at time t2 |

`year.t1` |
Year of time t1 |

`year.t2` |
Year of time t2 |

`methods` |
Method(s) used to calculate rate of decline. Either 'PRD', 'ARD', and/or 'ARC'. See vignette to see a more detailed explanation for each of them. |

A dataframe with absolute differences between the two inputs, and a selection of:

Proportional Rate of Decline (PRD)

Absolute Rate of Decline (ARD)

Annual Rate of Change (ARC)

Nicholas Murray [email protected], Calvin Lee [email protected]

Bland, L.M., Keith, D.A., Miller, R.M., Murray, N.J. and Rodriguez, J.P. (eds.) 2016. Guidelines for the application of IUCN Red List of Ecosystems Categories and Criteria, Version 1.0. Gland, Switzerland: IUCN. ix + 94pp. Available at the following web site: https://iucnrle.org/ Puyravaud, J.-P. 2003. Standardizing the calculation of the annual rate of deforestation. Forest Ecology and Management, 177, 593-596.

Other Change functions: `getAreaLoss`

,
`getArea`

1 2 3 4 | ```
a.r1 <- 23.55
a.r2 <- 15.79
decline.stats <- getDeclineStats(a.r1, a.r2, year.t1 = 1990, year.t2 = 2012,
methods = c('ARD', 'ARC'))
``` |

nick-murray/redlistr documentation built on Nov. 3, 2018, 5:18 a.m.

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