

   CCoo--ooppeerraattiivvee TTrriiaall iinn AAnnaallyyttiiccaall CChheemmiissttrryy

   AArrgguummeennttss::

        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.

   SSUUMMMMAARRYY::

        Seven specimens were sent to 6 laboratories in 3 sepa-
        rate batches and each analysed for Analyte.  Each anal-
        ysis was duplicated.

   DDAATTAA DDEESSCCRRIIPPTTIIOONN::

        This data frame contains the following columns:

   SSOOUURRCCEE::

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

   SSeeee AAllssoo::

        `chem', `abbey'.

