A Guide To Odds Ratios: What They Are and How To Communicate Them Clearly

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Despite being rather counter-intuitive Odds Ratios are frequently used to report the results of research in the medical and social sciences. Professor David Spiegelhalter explains how they're calculated, and how to turn them into something more meaningful for effective communication.

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David Spiegelhalter is a statistician, author and broadcaster. His book THE ART OF STATISTICS is a worldwide bestseller. He was the Winton Professor for the Public Understanding of Risk at the University of Cambridge for many years, and served a term as the President of the Royal Statistical Society.
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Thank you Professor Spiegelhalter for this excellent and pedagogical explanation.

danaros
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From the way this guy talks I trust him as a teacher

CraszyAsce
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I (student) was asked what they were in an interview and explaining clearly really stumped me. Do experienced statisticians have this problem too?

laurab.e.k.
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Isn't there an imbalance between the two groups since there are only 200ish in the depressed group and nearly 2500 in the non-depressed group? Is this why the odds ratio in the actual paper is adjusted?

CraszyAsce
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This video is like a box of chocolates, you never know what you're gonna get

daohoaxichbich
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He does a good job communicating risk and odds, that after a decade of reading reports about RR and OR, I can explain what they really mean. Thanks for saying not to communicate odds.

nl
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This was so nicely explained! you could sense the wisdom of the man from the way he was teaching.

tomgreen
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Perhaps there is a relation between the reason for use, I'm guessing that maybe people who suffer from depression are more likely to use cannabis as a means to deal with the disease burden...🤔

Inti.G.Olivares
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Дякую! Робіть більше таких відео. У Вас є талант пояснення концепцій. :) (Ukraine \ Irpine)

migel
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I do my diploma in clinical research, and this video is really informative and recommended for who are interested

looolie
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This was a wonderful video! I'm studying socioeconomics in Germany, and you really helped me out! Thanks for your impeckable work

Seitanistin
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Thanks for the explanation of OR.. that paper on depression.. according to the authors who tried to associate use of cannabis to depression.. what if those who use cannabis where already depressed..?

enriquecorona
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Can someone help me out please? When he calculated the RR, for the depressed group, how did the % become 15, when for the non depressed it was 5% if using the formula of RR?

fromthekitchenofhafsa
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i cant understand the difference [ odds - proballity ] from dies to come six ..i know the probality is 1 from 6 ..but what does 1 out of 5 means ?

misclic
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Professor Spiegelhalter…this is a fantastic presentation. I have shared to my students and residents from all walks of life. A question arose that I was hoping you could help with…and it's silly…what kind of "white" board are you writing on? I'm renovating one of our teaching rooms and I love the way that looks. Thanks!

eel
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shouldnt the percent for depressed be 18 percent? how come is 15 percent?

samraddhisinghmsc
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34 from132 ~ 1/4 or ~25% of smokers r depressed & 187 from 2336 ~ 1 /12, 5 or 8% non smokers r not depressed
i believe is the same numpers ? butwhy i find the above way more logical to calculate

misclic
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How do you add multiple odds ratios? Let’s say a patient has multiple risk factors for developing schizophrenia, each risk factor with a 2 fold possibility. (Ie having an older father, smoking cannabis, birth complications). Would you add them all together or multiple them?

TheRareCriticalThinker