How to write odds ratio Videos

something escape me.. let's take as example a mobile tower antenna in town. Now, draw a 300mt perimeter around taking the tower as center. This area will contain all exposed people from this antenna right? Among this people, we'll have people with disease (cases) and people with no disease (controls). Now, trace another perimeter starting from 300mt edges and beyond (ie: 400mt further). This latest one, will be the not exposed area in which in turn, we'll find people with disease (cases) and people without (controls). Now, let's use the table like in the video. Cell a: exposed+disease(exp+dis), Cell b: -exp+dis, Cell c:exp-dis, Cell d: -exp-dis. Place now some example values like follow: a=8, b=6, c=9, d=10 If we do calculation we'll obtain OR=1.48 and there's clearly an association (OR>1). Question: why cell b should influence the result? I mean, cell b represent the not exposed people with the disease. It means, that the disease for this group, could have different cause/origin than our cell phone antenna, because not exposed, right? Try to replace cell b by 9 and redo calculation. We'll obtain 0.98 that means a protective result (OR

Will be starting in a month or two your videos query could this help in stock trading. I realize there are no sure bets

Hi Brandon, Thanks for your video, I really enjoy watching and learning from it. However, I have some questions and confusion about the odds ratio. How does 10 pound increase in body weight increase the "odds" of having apnea to only 1.98? According to the statement, "...the odds ratio for a variable represent how the odds change with a 1 unit increase in that variable while holding all other variables constant", Shouldn't it be 1.07 * 10, thus gives 10.7 increase in the odds? How come it becomes the exponential relationship, 1.07^10 = 1.98? Thanks

*NEW VIDEO* is up! Second in the Logistic Regression Series

Thank you, I really appreciate these videos. I have a test on Friday and I am ready!!!