Cell counts {y ij } in an I J contingency table have a multinomial (n; {
Question:
Cell counts {yij} in an I × J contingency table have a multinomial (n; {πij}) distribution. Show that {P(Yij = nij), i = 1,..., I, j = 1,..., J} can be expressed as
where αij = πij πIJ/πIJ πIJ and d is a constant independent of the data. Find an alternative expression using local odds ratios {θij}, by showing that
Transcribed Image Text:
Γ1-1 J-1 d" n!Π Π (n;')' ep| ΣΣnlog(α,) i=1 j=1 -1 I-1 J-1 + Σn4 Ιog( πιμ/ πμ ) + Σn.log( πη/ πμ ) j log( πη/ πιu) i=1 j=1
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