background.resp {rMR}

Determine the Background Respiration in a Respirometer

Description

Takes user-defined start and end times to calculate the backround respiration rate in a respirometer.

Usage

background.resp(data, DO.var.name,
time.var.name = "std.time", 
start.time, end.time, col.vec = c("black","red"),...)

Arguments

data

data.frame object to be used, best if formatted by get.witrox.data().

DO.var.name

Column name of DO variable, formatted as a character string.

time.var.name

Column name of time variable as character string. Time column must be formatted as default class for datetime: class = "POSIXct" "POSIXt", strptime format = "%Y-%m-%d %H:%M:%S".

start.time

Input start time as character string of strptime format = "%Y-%m-%d %H:%M:%S".

end.time

Input endtime as character string of strptime format = "%Y-%m-%d %H:%M:%S".

col.vec

Specifies colors on plot in the following order: 1) scatterplot points, 2) regression color.

...

Passes on arguments to internal functions.

Value

Returns an object of method biglm. The slope of this funtion is the metabolic rate in input units/(default time).

Author(s)

Tyler L. Moulton

References

Thomas Lumley (2013). biglm: bounded memory linear and generalized linear models. R package version 0.9-1. https://CRAN.R-project.org/package=biglm.

See Also

as.POSIXct, strptime, biglm

Examples

##load data##
data(fishMR)

## create time variable in POSIXct format ##
fishMR$std.time <- as.POSIXct(fishMR$Date.time,
                    format = "%d/%m/%Y %I:%M:%S %p")

bgd.resp <- 
background.resp(fishMR, "DO.mgL", 
           start.time = "2015-07-02 16:05:00",
           end.time = "2015-07-02 16:35:00")