process.sd {merror}

Compute process standard deviation

Description

This function computes the process standard deviation and is used internally by the function precision.grubbs.ncb.od.

Usage

process.sd(x)

Arguments

x

A matrix or numeric data.frame consisting of an n (no. of items) by N (no. of methods) matrix of measuremnts.

Details

The process standard deviation is the standard deviation of the true values uncontaminated by measurement error. See Jaech, p. 185.

Value

A scalar containing the method of moments estimate of the process standard deviation.

Author(s)

Richard A. Bilonick

References

Jaech, J. L. (1985) Statistical Analysis of Measurement Errors. New York: Wiley.

See Also

precision.grubbs.ncb.od

Examples

data(pm2.5)
process.sd(pm2.5) # estimate of the sd of the "true values using the method of moments")