coop {MASS} | R Documentation

## Co-operative Trial in Analytical Chemistry

### Description

Seven specimens were sent to 6 laboratories in 3 separate batches and each analysed for Analyte. Each analysis was duplicated.

### Usage

    data(coop)

### Format

This data frame contains the following columns:

`Lab`
  Laboratory, `L1`, `L2`, ..., `L6`.
`Spc`
  Specimen, `S1`, `S2`, ..., `S6`.
`Bat`
  Batch, `B1`, `B2`, `B3` (nested within `Spc/Lab`),
`Conc`
  Concentration of Analyte in g/kg.

### Source

Analytical Methods Committee (1987) Recommendations for the conduct and interpretation of co-operative trials, The Analyst 112, 679–686.

### References

Venables, W. N. and Ripley, B. D. (2002) Modern Applied Statistics with S. Fourth edition. Springer.

### See Also

`chem`, `abbey`.

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