G*Power: โปรแกรมทางเลือกส าหรับค านวณขนาดตัวอย่าง

G*Power:

Kittisakdi Choomalee, Supeecha Rungruang: Holistic Health and Safety Management in

the Community Research Unit (HASM), PSU

application n4studies smartphone/ tablet i OS Android G*Power Application Application OS X Windows G*Power Application n4studies Download G*power Heinrich-Heine-Universit?t D?sseldorf Download Windows version ... OS X Version ... ...

G*Power 1. Tests 2. 3.

 logistic regression

 Test family

1. Test family family (Distribution-based approach) Logistic regression Logistic regression family Z tests

2. Logistic regression 3. (A Priori: Compute required sample size ? given , power

and effect size) 4. review ( Odds ratio, alpha,

power, event rate H0 (Null hypothesis) (x) binomial (x parm =0.5 balanced design ) (?) () (x) (normal distribution)) alpha () power (power = 1- ) Type I error Type II error 5% 20% R? default 0 ( covariates covariates correlation covariates ) 5. calculate

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