What does the variable Icirc sup2 1 mean in the 2nd logistic regression (Table 13 63) How does it differ from the meaning of Icirc sup2 1 in the 1st logistic regression (Table 13 62) Two logistic models were run with Stata Version 11 using these data For the 1st model (Table 13 62) we fit Logit (P ...

What does the variable Î² 1 mean in the 2nd logistic regression (Table 13.63)? How does it

Question:

What does the variable Î²₁mean in the 2nd logistic regression (Table 13.63)? How does it differ from the meaning of Î²₁in the 1st logistic regression (Table 13.62)?

Two logistic models were run with Stata Version 11 using these data. For the 1st model (Table 13.62) we fit

Logit (P_i) = Î± + Î²₁x₁ + Î²₂x₂,

Where x₁ = age at menarche (1 represents ‰¥ 12, 0 represents < 12),

X₂ = race (1 = African American, 0 Caucasian).

For the 2^nd model (Table 13.63) we fit

Logit (Pi) = Î± + Î²₁x₁ + Î²₂x₂ + Î²₃x₁x₂.

Table 13.62 Logistic regression of ovarian cancer on age at menarche and race

logit case ageatmenarche race [fweight=freq] Logistic regression Number of obs 1907 LR chi2 (2) 15.76 Prob > chi2 0.0004

Table 13.63 Logistic regression of ovarian cancer on age at menarche, race, and age at menarche Ã— race

logit case ageatmenarche race agemenarche_race [fweight=freq] Logistic regression Number of obs 1907 LR chi2 (3) 18.66 P

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