Measurement Variability Test Data

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Description

A data frame of magnetic susceptibility data used by Stanley (2003) to demonstrate the Thompson-Howarth procedure for estimating analytical variability (Thompson and Howarth, 1973 & 1978). They are used in the rgr package examples for the duplicate analysis ANOVA and Thompson-Howarth plot functions, anova2 and thplot2, respectively, with ifalt = FALSE. See also Garrett and Grunsky (2003).

Usage

1

Format

A data frame containing 2 measurements of magnetic susceptibility for each of 16 rock samples in 32 records. The measurements for the original analyses are in records 1 to 16, and the duplicate measurements are in records 17 to 32 in the same order.

Source

Stanley (2003), see below.

References

Garrett, R.G. and Grunsky, E.C., 2003. S and R functions for the display of Thompson-Howarth plots. Computers & Geosciences, 29(2):239-242.

Stanley, C.R., 2003. THPLOT.M: a MATLAB function to implement generalized Thompson-Howarth error analysis using replicate data. Computers & Geosciences, 29(2):225-237.

Thompson, M. and Howarth, R.J, 1973. The rapid estimation and control of precision by duplicate determinations. The Analyst, 98(1164):153-160.

Thompson, M. and Howarth, R.J, 1978. A new approach to the estimation of analytical precision. Journal of Geochemical Exploration, 9(1):23-30.

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