SynopsisThis pathbreaking graduate text in quantitative methodology attempts to provide a solution to a number of problems which have confronted empirical social science throughout its history -- the general overload of statistics and the apparents distinction between methods appropriate for analysis of variance and those appropriate for analysis of quasi-experiments -- proposing a linear model as the general and unified statistical model applicable to a full range of experimental designs. "An extremely sensible and usable step beyond its competitors. I will strongly recommend it to my students." --Steven Penrod, University of Wisconsin. "Deserves a place on that small shelf of valuable references for knowledgeable causal researchers." --Contemporary Psychology