Ning Liu

4 Questions 11 Answers 0 Followers

Questions related from Ning Liu

How to calculate relative risk if the reference group has an incidence of 0?

Hi Researchers, this appears to be a quite difficult question. As we know, if 20% of the smokers developed lung cancer and 10% of the non-smokers developed lung cancer, then we say that cigarette...

14 October 2017 8,390 7 View

Can we use odds ratios of logistic regression, instead of the coefficients (beta), to derive risk score in risk prediction model?

Hi researchers, this is a question about risk prediction model. As we know, after running the logistic regression model, we get a set of "coefficients" (beta) of the predictors, and we can use...

08 September 2017 5,485 4 View

How many independent variables to include BEFORE running logistic regression?

Dear researchers, in real world, a "reasonable" sample size for a logistic regression model is: at least 10 events (not 10 samples) per independent variable. My question is: does this rule refer...

07 September 2017 5,078 10 View

What does the "mean survival time" in SPSS survival curve analysis mean?

Regardless of the censor status, every case in a survival analysis has a survival time, being either the time between diagnosis and event or the time between diagnosis and censor (lost to...

20 January 2016 2,766 6 View