naMeanSubst: Replace Missing Data by Population Average

In MarekSlenker/MorphoTools2: Multivariate Morphometric Analysis

Replace Missing Data by Population Average

Description

This function substitutes missing data using the average value of the respective character in the respective population.

Usage

naMeanSubst(object)

Arguments

object

an object of class morphodata.

Details

Generally, most of the multivariate analyses require a full data matrix. The preferred approach is to reduce the data set to complete observations only (i.e., perform the casewise deletion of missing data) or to remove characters for which there are missing values. The use of mean substitution, which introduces values that are not present in the original data, is justified only if (1) there are relatively few missing values, (2) these missing values are scattered throughout many characters (each character includes only a few missing values) and (3) removing all individuals or all characters with missing data would unacceptably reduce the data set.

Value

an object of class morphodata with the following elements:

ID	IDs of each row of data object.
Population	population membership of each row of data object.
Taxon	taxon membership of each row of data object.
data	data.frame of individuals (rows) and values of measured morphological characters (columns).

Examples

data(centaurea)

centaurea = naMeanSubst(centaurea)

MarekSlenker/MorphoTools2 documentation built on Oct. 2, 2024, 5:58 p.m.