na: Basic Statistical Functions for Handling Missing Values
Description
Basic statistical functions for handling missing values or NA.
In log.na, sum.na, mean.na and var.na,
quantile.na, length.na, missing values are omitted
from the calculation.
The function cor.na calls cor with the argument
use="pairwise.complete.obs".
The function order.na only handles vector arguments and not
lists. However, it gives the option of omitting the NAs
(na.last=NA), of placing the NAs at the start of the ordered
vector (na.last=F) or at the end (na.last=T).
The function scale.na is a modified version of
scale which allows NAs in the variance calculation. If
scale = T, the function f in scale.na uses
var.na to perform the variance calculation.
The function prod.na is similar to the prod
function with na.rm=TRUE. This function returns the product of
all the values present in its arguments, omitting any missing values.