MKT 317 Lecture Notes - Lecture 10: Multiple Comparisons Problem, Ssab
Document Summary
The mclave text uses n ab for error df. R = # of observations in each combination. Mean square: mse = [sse/ (ab (r 1))] = [sse/ (n ab)] Fcalc: r = cell size = n/ab, n = total sample size. Msa = ssa/ (a 1), fa = msa/ mse. Msb = ssb/ (b 1), fb = msb/ mse. Msab = ssab/ [(a 1) (b 1)], fab = msab/ mse. Raw data on slide from computer output. Interaction: msa = 6176. 04/ (2 1) = 6176. 04. Msb = 6853. 12/ (4 1) = 2284. 37. Mse = 19566. 67/ 2(4) (3 1) = 1222. 92. Example: test whether there is an effect of gender, department, or any combination of gender & department, an amount of ot worked by employee: h0: 1 = 2 = 0. A - h1: not all j = 0. B - h0: b1 = b2 = b3 = b4 (department)
