imageData (version 0.1-61)

splitValueCalculate: Calculates a single value that is a function of an individual's values for a response

Description

Splits the values of a response into subsets corresponding individuals and applies a function that calculates a single value to each individual's observations. It includes the ability to calculate the observation that corresponds to the calculated value of the function.

Usage

splitValueCalculate(response, weights=NULL, individuals = "Snapshot.ID.Tag", 
                    FUN = "max", which.obs = FALSE, which.levels = NULL, 
                    data, na.rm=TRUE, sep=".", ...)

Value

A data.frame, with the same number of rows as there are

individuals, containing the values of the function for the

individuals.

Arguments

response

A character giving the name of the column in data from which the values of FUN are to be calculated.

weights

A character giving the name of the column in data containing the weights to be supplied as w to FUN.

individuals

A character giving the name(s) of the factor(s) that define the subsets of the data for which each subset corresponds to the response value for an individual.

FUN

A character giving the name of the function that calculates the value for each subset.

which.obs

A logical indicating whether or not to determine the observation corresponding to the value of the function, instead of the value of the function itself.

which.levels

A character giving the name of the factor whose levels are to be identified as the level of the observation whose value matches the value of the function.

data

A data.frame containing the column from which the function is to be calculated.

na.rm

A logical indicating whether NA values should be stripped before the calculation proceeds.

sep

A character giving the separator to use when the levels of individuals are combined. This is needed to avoid using a character that occurs in a factor to delimit levels when the levels of individuals are combined to identify subsets.

...

allows for arguments to be passed to FUN.

Author

Chris Brien

See Also

splitContGRdiff, splitSplines

Examples

data(exampleData)
Area.smooth.max <- splitValueCalculate("Area.smooth", data = longi.dat)