This is the third and last part of my attempt to explain logistic regression in pictures. You can see a picture of odds ratios here, and a picture of two charts of predicted probabilities, to compare models, here. If people only know one chart associated with logistic regression, it is usually the ROC chart, though…
I tweeted that I believed one could explain logistic regression results in three or four charts, and Alberta Soranzo tweeted back, “Try me.” Challenge accepted. These data are taken from the Kaiser-Permanente study of the Oldest Old, a sample of 5,986 people who were aged 65-95 when recruited into the study. Participants were followed for…
One nice thing that SAS Enterprise Guide does is produce a series of graphs when you do a logistic regression. Too many people just skim over the table of Type III effects, say what is significant and isn’t and go on their merry way, which is too bad, because sometimes your graphs are very easy…
A two-by-two table is a very common design. The column variable is some type of treatment or intervention. For example, older (over 65 years of age) people who either lived in a nursing home or who did not. Your row variable is some categorical outcome. For example, they either lived or died. You create a…
My long and occasionally-storied career began as an industrial engineer, where I had drilled into my brain one of my most useful life lessons. Here is the secret to mastering your life, reducing your stress by a good 50% — Learn the difference between standard hours and actual hours The business dictionary laughably defines a standard…
Several years ago, I was reassured once again that I had married the right person when The (much smaller then but equally) Spoiled One asked him, “What does the name of your book mean, God created the integers?” He explained that while one can have 1 rabbit or 2 rabbits You can have zero rabbits….
Last month, I was super-stoked to be listed in Forbes as one of the 40 women to watch over 40. As I’ve written on here several times, I call bullshit on the belief that start-ups must all be run by Mark Zuckerberg clones. The idea that everyone over 30 has outdated skills is based on…
After installing the latest version of SOD with Enterprise Guide 6.1 on Virtual Box and finding it really slow, I decided to re-install the operating system I had on bootcamp to upgrade to 64-bit and see if it ran better native. When I downloaded the file to install it said it was not compatible with…
Because it’s not tomorrow until I go to bed and get up again, as far as I’m concerned this is still technically the weekend so I am going to dispense Mama AnnMaria’s advice on personal relationships. … I blame the internet. My grandmother told me (more than once) that if your husband doesn’t beat you,…
There have been days, especially when I started my first two businesses, when I was seriously stressed. What if I could not make the payroll? What about cash flow when the business was growing and expenses were due now but customers didn’t pay until the end of the month? What if … for most small…