On Feb 16, SK summarized the investigations and here I embellish those summaries: 1) Effects of age and company on resistance to each antibiotic (Tet10, Str15, E10, K25 and NA20) were investigated using loglinear models. The GENMOD procedure in SAS was used to fit the models and make comparisons among the ages and companies. ----------------------------- Company=G antibiotic=E10 ------------------------------ ----------------------------- Company=G antibiotic=K25 ------------------------------ Score Statistics For Type 3 GEE Analysis Chi- Source DF Square Pr > ChiSq species 1 1.38 0.2402 period 2 3.47 0.1761 period*species 2 1.08 0.5829 ----------------------------- Company=G antibiotic=NA20 ----------------------------- The GENMOD Procedure Score Statistics For Type 3 GEE Analysis Chi- Source DF Square Pr > ChiSq species 1 0.37 0.5448 period 2 8.56 0.0138 period*species 2 2.70 0.2587 ---------------------------- Company=G antibiotic=Str15 ----------------------------- The GENMOD Procedure Score Statistics For Type 3 GEE Analysis Chi- Source DF Square Pr > ChiSq species 1 7.74 0.0054 period 2 13.64 0.0011 period*species 2 4.17 0.1245 ---------------------------- Company=G antibiotic=Tet10 ----------------------------- ----------------------------- Company=P antibiotic=E10 ------------------------------ ----------------------------- Company=P antibiotic=K25 ------------------------------ Score Statistics For Type 3 GEE Analysis Chi- Source DF Square Pr > ChiSq species 1 1.19 0.2748 period 2 3.54 0.1699 period*species 2 0.20 0.9033 ----------------------------- Company=P antibiotic=NA20 ----------------------------- ---------------------------- Company=P antibiotic=Str15 ----------------------------- ---------------------------- Company=P antibiotic=Tet10 -----------------------------