ms.data2: Measurement Variability Test Data
Description
These magnetic susceptibility data were used by Stanley (2003) to demonstrate the Thompson-Howarth (Thompson and Howarth, 1973 & 1978) procedure for estimating analytical variability. 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).source
Stanley (2003), see below.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.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.