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metRology (version 0.9-28-1)

RMstudy: Collaborative study results for metals in a reference material certification study

Description

A data frame containing reported replicate results, in mg/L, for elements reported in an inter-laboratory certification study for a candiate drinking reference material.

Usage

data(RMstudy)

Arguments

Format

A data frame with 145 observations on the following 9 variables.

Lab

a factor with levels Lab1 - Lab29

Arsenic

a numeric vector

Cadmium

a numeric vector

Chromium

a numeric vector

Copper

a numeric vector

Lead

a numeric vector

Manganese

a numeric vector

Nickel

a numeric vector

Zinc

a numeric vector

Details

The data set includes results for eight of a total of 23 elements studied in an inter-laboratory study of a candidate reference material. All observations are reported in ug/l. Laboratories were asked to report 5 replicate observations for each element. Replicate observations appear on separate rows. Most but not all laboratories reported five replicates, and some laboratories reported no results for some elements. The eight elements included in the data set are those for which no more than three laboratories failed to report any results. Missing observations are coded NA.

Laboratories were coded anonymously in order of receipt of results.