Pendeteksian Sumber Ketidakbebasan

Jika suatu tabel kontingensi rxc

diketahui tak bebas maka ada 2

kemungkinan sebab

1.

Seluruh sel i,j (atau sebagian

besar sel i,j)

2.

Satu atau dua sel i,j ( ada

kemungkinan kesalahan

Pemecahan Tabel



Jika peubah acak X ~



_2a

dan Y ~



_2b

maka (X+Y) ~



_{2 (a+b)}



Tabel asal dapat dipecah menjadi

Rules for Partitioning

1.

The df for the subtables must

sum to df for the full table.

2.

Each cell count in the full table

must be a cell count in one

and onlyone subtable.

3.

Each marginal total of the full

Contoh 1



Ujilah apakah peubah A dan peubah B

saling bebas?

TABLE 3.3 Most Influential School of Psychiatric Thought and Ascribed Origin of Schizophrenia

School of Origin of Schizophrenia

Psychiatric Thought Biogenic Environmental Combination ---Eclectic 90 12 78

Medical 13 1 6 Psychoanalytic 19 13 50

---Source: Reprinted with permission, based on data from B. J. Gallagher III, B. J. Jones, and L. P.