Why We Use Log Odds in Logistic Regression Instead of Probabilities?

When we have a binary outcome variable (i.e. "disease"; "no disease"), we use logistic regression to establish a linear relationship between the outcome variable and the predictor variables. The equation for logistic regression looks like this:  log(probability/(1-probability))= β0 + β1x1 + … + βkxn + ε Here, probability/(1-probability) = odds of outcome So, log (odds of outcome)= β0 +... Continue Reading →

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Understanding Probability and Odds

I have seen many people working in medical and public health research often struggle to learn logistic regression because they cannot get their heads around the concept of odds. Odds represents the likelihood of occurring a specific event. We generally are not wired to think likelihood in odds scale; probability is more intuitive to most of us. Some... Continue Reading →

3 Mobile Apps to Organize Your Grad Life

Life of a grad student is a difficult and messy one. One also has to read hundreds of research papers, browse tons of websites and online discussion forums, scribble research ideas (both futile and fruitful ones), keep track of those ideas and related experiments and the list goes on. There are submission deadlines, meetings with... Continue Reading →

Can KI beat Harvard?

It was the first day as a master thesis student at the department of Medical Epidemiology and Bio-statistics, aka MEB, at Karolinska Institutet. And I had the opportunity to attend this very interesting and intriguing seminar "Can KI beat Harvard?" The speaker of the seminar was Professor Hans-Olov Adami and surely he is the right person to... Continue Reading →

Nobel Lecture in Medicine 2015

The Nobel Prize in Physiology or Medicine 2015 was awarded with one half jointly to William C. Campbell and Satoshi Ōmura for their discoveries concerning a novel therapy against infections caused by roundworm parasites and the other half to Youyou Tu for her discoveries concerning a novel therapy against Malaria. Had the opportunity to attend... Continue Reading →

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