tot.rss: Total Residual Sum of Squares for Broken Stick Model

In rMR: Importing Data from Loligo Systems Software, Calculating Metabolic Rates and Critical Tensions

Description

Calculates the total residual sum of squares for broken stick model (2 part)

Usage

tot.rss(data, break.pt, xvar, yvar)

Arguments

data	data frame for calculating total residual sum of squares.
break.pt	This is the data point at which the data are split for a broken stick model.
xvar	The x-variable in the data frame for broken stick model.
yvar	The y-variable in the data frame for broken stick model.

Value

The residual sum of squares of a broken stick model with a specified break point.

Author(s)

Tyler L. Moulton

See Also

codesumsq codeget.pcrit

Examples

## load data ##
data(fishMR)

## subset data to appropriate region ##

data<-fishMR[fishMR$DO.mgL < 4,] 
data$times <- data$times-min(data$times)
data<-data[data$times< 6800,]

## calculate total RSS for different breakpoints ##

a1 <- tot.rss(data, break.pt = 4000,
xvar = "times", yvar = "DO.mgL") 
a2 <- tot.rss(data, break.pt = 4250,
xvar = "times", yvar = "DO.mgL")
a3 <- tot.rss(data, break.pt = 4500,
xvar = "times", yvar = "DO.mgL")
a4 <- tot.rss(data, break.pt = 4750,
xvar = "times", yvar = "DO.mgL") 
a5 <- tot.rss(data, break.pt = 5000,
xvar = "times", yvar = "DO.mgL")
a6 <- tot.rss(data, break.pt = 5250,
xvar = "times", yvar = "DO.mgL")

# a5 represents the break point for the 
# best broken stick linear model of the
# above 6 options.

rMR documentation built on May 2, 2019, 6:51 a.m.