Was PayPal trying to verify your identity or that you know your recipient's identity (who's coincidentally your mother)? I'm surprised if PayPal expected you to know your recipient's birthday, but "What's your mother's…
I've found them at HEB and Randall's too!
One of my favorite data science factoids is how "regression" (to return to a former state) came to mean "prediction of a continuous variable". In the late 1800s, Sir Francis Galton noticed that extremely tall or short…
Santa Clara County (South Bay Area) shares a dashboard with cases by age group and deaths by age group: https://www.sccgov.org/sites/phd/DiseaseInformation/novel-co...
They approximated income, education, and ethnicity at the neighborhood-level (400-600 people) based on census data. That doesn't seem granular enough to me if the poorest families in each neighborhood live closest to…
The problem is with multiple-day recovery periods after the surgery. The later in the week your surgery is scheduled, the more likely you'll overlap with the weekend when care is hypothesized to be lower quality.
> Choosing Monday for a surgery increases your chance of success 2 times The title seems poorly worded. The researchers studied mortality rate, not success of procedures. Since these were elective surgeries, I assume…
You're looking to test the difference in proportions. I entered 0.93 / 1000 / 0.91 / 650 into this online calculator [1] and got a p-value of 0.14 which means that the difference is not statistically significant.…
When Irma was making landfall two years ago, I did an animation demonstrating this for r/DataIsBeautiful. [1] The real hurricane path is in red with the forecast at each timestamp in black. If you look at the forecasts…
There are always potential issues when a machine learning algorithm is applied over time. Example #1: Let's say that cancer rates are increasing over time and cameras are improving over time. You might end up with a…
Thank you for the useful feedback! I'll have to look up GUIDE trees. > This is interesting. I hear it was sqroot(total number of predictors). I was probably looking at the randomForest R package documentation [1], which…
I wrote this regression tree tutorial a few years back that might be a good complement to the tutorial above since it covers regression instead of classification and goes on to talk about bagging vs random forest,…
I wonder if this study takes into account that, because some professions are skewed toward women and others are skewed toward men, on average women will interact more with women than with men on a daily basis. Instances…
I couldn't find a more recent source (this is from 2013), but it claims that 12% of SF (San Francisco-San Mateo-Redwood City, CA) jobs are in "high tech" and 29% of San Jose-Sunnyvale-Santa Clara, CA jobs. My guess is…
This is my favorite statistics factoid! Regression/reversion to the mean is the idea that if you observe an extreme value and remeasure it, it will tend toward the average value on the second observation. For example,…
Was PayPal trying to verify your identity or that you know your recipient's identity (who's coincidentally your mother)? I'm surprised if PayPal expected you to know your recipient's birthday, but "What's your mother's…
I've found them at HEB and Randall's too!
One of my favorite data science factoids is how "regression" (to return to a former state) came to mean "prediction of a continuous variable". In the late 1800s, Sir Francis Galton noticed that extremely tall or short…
Santa Clara County (South Bay Area) shares a dashboard with cases by age group and deaths by age group: https://www.sccgov.org/sites/phd/DiseaseInformation/novel-co...
They approximated income, education, and ethnicity at the neighborhood-level (400-600 people) based on census data. That doesn't seem granular enough to me if the poorest families in each neighborhood live closest to…
The problem is with multiple-day recovery periods after the surgery. The later in the week your surgery is scheduled, the more likely you'll overlap with the weekend when care is hypothesized to be lower quality.
> Choosing Monday for a surgery increases your chance of success 2 times The title seems poorly worded. The researchers studied mortality rate, not success of procedures. Since these were elective surgeries, I assume…
You're looking to test the difference in proportions. I entered 0.93 / 1000 / 0.91 / 650 into this online calculator [1] and got a p-value of 0.14 which means that the difference is not statistically significant.…
When Irma was making landfall two years ago, I did an animation demonstrating this for r/DataIsBeautiful. [1] The real hurricane path is in red with the forecast at each timestamp in black. If you look at the forecasts…
There are always potential issues when a machine learning algorithm is applied over time. Example #1: Let's say that cancer rates are increasing over time and cameras are improving over time. You might end up with a…
Thank you for the useful feedback! I'll have to look up GUIDE trees. > This is interesting. I hear it was sqroot(total number of predictors). I was probably looking at the randomForest R package documentation [1], which…
I wrote this regression tree tutorial a few years back that might be a good complement to the tutorial above since it covers regression instead of classification and goes on to talk about bagging vs random forest,…
I wonder if this study takes into account that, because some professions are skewed toward women and others are skewed toward men, on average women will interact more with women than with men on a daily basis. Instances…
I couldn't find a more recent source (this is from 2013), but it claims that 12% of SF (San Francisco-San Mateo-Redwood City, CA) jobs are in "high tech" and 29% of San Jose-Sunnyvale-Santa Clara, CA jobs. My guess is…
This is my favorite statistics factoid! Regression/reversion to the mean is the idea that if you observe an extreme value and remeasure it, it will tend toward the average value on the second observation. For example,…