logistics函数S型曲线: Odds ratio反应事件发生的倾向性 logistics函数与probit regression function很像,但是logistics函数基于二项分布,probit regression function基于正态分布。 probit regression function:正态分布的累计概率曲线 logistics函数不需要独立+方差齐性+正态性。 p是怎么根据x变化的,求其偏导: 其中,α和...
Probability vs Odds Vs Odds Ratio 1. Probability = Event/Sample Space 2. Odds= Prob(Event)/Prob(Non-Event) 3. Odds Ratio = Odds(Group 1)/ Odds(Group 2) Interpretation The Odds Ratio is a measure of association between exposure and outcome. OR=Odds(Group 1)/Odds(Group2)>1 indicates ...