00456nam a2200133Ia 4500008004100000082002300041100002400064245005400088260003300142300002200175490006000197700003100257700003400288250225b        |||||||| |||| 00| 0 eng d  a519.50184bC663.PA  aCochran, William G.  aPlanning and analysis of observational studiesb/  aNew York:bJohn Wiley,c1983  axiii, 145p. Index  aWiley series in Probability and Mathematical Statistics  aMoses, Lincoln E.eeditor.  aMosteller, Frederickeeditor.