get_coef: Calculate the intercepts and slopes of the different segments

In txm676/sars: Fit and Compare Species-Area Relationship Models Using Multimodel Inference

Calculate the intercepts and slopes of the different segments

Description

Calculate the intercepts and slopes of the different segments in any of the fitted breakpoint regression models available in the package.

Usage

get_coef(fit)

Arguments

fit	An object of class 'thresholds', generated using the sar_threshold function.

Details

The coefficients in the fitted breakpoint regression models do not all represent the intercepts and slopes of the different segments; to get these it is necessary to add different coefficients together.

Value

A dataframe with the intercepts (ci) and slopes (zi) of all segments in each fitted model. The numbers attached to c and z relate to the segment, e.g. c1 and z1 are the intercept and slope of the first segment. For the left-horizontal models, the slope of the first segment (i.e. the horizontal segment) is not returned. NA values represent cases where a given parameter is not present in a particular model.

Examples

data(aegean2)
a2 <- aegean2[1:168,]
fitT <- sar_threshold(data = a2, mod = c("ContOne", "DiscOne", "ZslopeOne"),
interval = 0.1, non_th_models = TRUE, logAxes = "area", logT = log10)
#get the slopes and intercepts for these three models
coefs <- get_coef(fitT)
coefs

txm676/sars documentation built on Nov. 20, 2023, 7:29 p.m.