qqsad and qqrad methods | R Documentation |

Plots empirical quantiles vs corresponding theoretical values expected by a model for species abundances (SAD) or a model for species abundance ranks (RAD).

```
## S4 method for signature 'fitsad'
qqsad(x, plot=TRUE, line=TRUE, ...)
## S4 method for signature 'numeric'
qqsad(x, sad, coef, trunc=NA, distr, plot=TRUE,
line=TRUE, ...)
## S4 method for signature 'fitrad'
qqrad(x, plot=TRUE, line=TRUE, ...)
## S4 method for signature 'rad'
qqrad(x, rad, coef, trunc=NA, plot=TRUE, line=TRUE, ...)
## S4 method for signature 'numeric'
qqrad(x, rad, coef, trunc=NA, plot=TRUE, line=TRUE, ...)
```

`x` |
a numeric vector of abundances of
species or a fitted sad/rad model (object of |

`sad` , `rad` |
character; root name of sad or rad
distribution to calculate expected percentiles. See |

`coef` |
named list of numeric values; parameter values of the
distribution given in |

`trunc` |
non-negative integer, |

`distr` |
Deprecated since sads 0.2.4. See |

`plot` |
logical; if |

`line` |
logical; if |

`...` |
further arguments to be passed to the |

- qqsad
`signature(x = "fitsad", sad = "missing", coef = "missing", trunc = "missing", distr = "missing", plot="ANY", line="ANY")`

: quantile-quantile plot for a fitted model of species abundances (a`fitsad-class`

object). Only argument`x`

should be provided- qqsad
`signature(x = "numeric", sad = "character", coef = "list", trunc = "ANY", distr = "ANY", plot="ANY", line="ANY")`

: quantile-quantile plot of a numeric vector of abundances (`x`

) vs a species abundance distributions defined by the following arguments.- qqrad
`signature(x = "fitrad", rad = "missing", coef = "missing", trunc = "missing", plot="ANY", line="ANY")`

: quantile-quantile plot for a fitted model of species abundances ranks (a`fitrad-class`

object). Only argument`x`

should be provided- qqrad
`signature(x = "rad", rad = "character", coef = "list", trunc = "ANY", plot="ANY", line="ANY")`

: quantile-quantile plot of a table of abundance ranks (`x`

) vs a species rank-abundance distribution defined by the following arguments.- qqrad
`signature(x = "numeric", rad = "character", coef = "list", trunc = "ANY", plot="ANY", line="ANY")`

: quantile-quantile plot of a numeric vector of abundances (`x`

) vs a species rank-abundance distribution defined by the following arguments.

Paulo I Prado prado@ib.usp.br and Murilo Dantas Miranda.

Thas, O. 2010. Comparing distributions. Springer.

```
## An example with SADs
data(moths)
## fits log-series distribution to abundance data
moths.ls <- fitsad(moths, "ls")
## fits lognormal distribution truncated at 0.5
moths.ln <- fitsad(moths,"lnorm", trunc=0.5)
## Plots with the model object and with abundance vector
par(mfrow=c(2,2))
qqsad(moths.ls)
qqsad(moths, sad="ls", coef=as.list(coef(moths.ls)))
qqsad(moths.ln)
qqsad(moths, sad="lnorm", coef=as.list(coef(moths.ln)), trunc=0.5)
par(mfrow=c(1,1))
## An example with RADs
data(okland)
## Fits broken-stick RAD model
ok.bs <- fitrad(okland, "rbs")
## Fits geometric series RAD model
ok.gs <- fitrad(okland, "gs")
## Plots with the model object and with the abundance vector
par( mfrow=c(2, 2) )
qqrad(ok.bs)
qqrad(okland, rad="rbs", coef=as.list(coef(ok.bs)))
qqrad(ok.gs)
qqrad(okland, rad="gs", coef=as.list(coef(ok.gs)))
par(mfrow=c(1,1))
```

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