TSS: True skill statistic
In rkrug/TSS: Basic and extended TSS Statistics (True Skill Statistics)

Description Usage Arguments Details Value Author(s)

True skill statistic (TSS) Function

1 2	TSS(cont1, cont2 = NULL, presAbs, thresh1, thresh2, largerPres1 = TRUE, largerPres2 = FALSE, link = `&`)

`cont1,`	`vector` of simulation of any continuous variable which has been choosen as a primary proxy of fitness
`cont2`	`vector` of simulation of any continuous variable which has been choosen as a secondary proxy of fitness. If `is.null(cont2)`, a simple TSS is calculated.
`presAbs`	`vector` of presence/absence data, can be logical
`thresh1`	`vector` containig the threshold values for `cont1`
`thresh2`	`vector` containig the threshold values for `cont2`
`largerPres1`	if `TRUE`, `cont1` values larger then the threshold specify presence, if `FALSE` `cont1` values smaller.
`largerPres2`	if `TRUE`, `cont2` values larger then the threshold specify presence, if `FALSE` `cont2` values smaller.
`link`	a vectorised function returning a `logical` vector of the same length as the exactly two `logical` input vectors. The default is the function `&`. It has to be specified using backquotes (i.e. "'&'" or "'\|'").

TSS is an index of the goodness-of- fit allowing to assess a how much a continuous variable simulated by any model fit presence/absence data. It thus allows to translate a map of any continuous variable into a map of presence/absence for a given set of spatial simulation at the species level. This is made possible by finding the threshold value of the continuous variable used as a procxy of fitness (e.g. growth, productivity..).

This version extends the function TSS to using two continuous variables (cont1 and cont2) and two thresholds (thres1 and thresh2) to predict presAbs

If largerPres1==TRUE and codelargerPres2==TRUE the system represents facilitation, while largerPres1==TRUE and codelargerPres2==FALSE represents competition.

If is.null(cont2) the function returns the normal default TSS.

Note that cont1 and verref must match spatially (same ranking and same size)

An object of class TSS TODO

Rainer M. Krug Rainer@krugs.de

rkrug/TSS documentation built on July 6, 2019, 4:37 p.m.