"I'm sorry, but the fact that a credit card number or SSN has been stolen is completely independent of its attributes (like issuing bank or uniqueness). An identity has an economic value, therefore it gets stolen -- it has nothing to do with…"
"Are you doing time series modeling or cross-sectional modeling? What's the dependent variable?
If you are doing time series analysis (example: using weather over time to predict today's crop yield), then you want to create…"
"It's a classification model - correct classification rate where type 1 and type 2 error are minimized is the most important measure of model fitness. The client is actually doing it the right way.
Our job as statisticians and modelers is…"
"The output they're requesting seems consistent with what I've seen for similar competitions in the past. The idea is accuracy - if your models are going to be used for real time credit decisions, then the only thing they're…"
"The paradox you describe reminds me of another "paradox" where a naive demographer concludes from cross-sectional data that people in Florida change their religious preference in their lifetime because the % Catholic among young people in…"
"Thanks, HURT - you didn't say anything wrong, and chances are that Mr Granville is probably my age, which is why his attitudes are so unfortunate. My beef is with two statements:- "you have ...and more women than in many analytic…"
"Everything originally stated about making sure you consistently quantify how results and recommendations impact business performance, plus what Sam said, plus:
7. The ability to interpret and share complex results in applied mathematics / IT using…"
"Segmentation. Technically, sorting people by hair color is segmentation.
Most best segmentation solutions contain multiple dimensions:
1. Value dimension (historical and predicted) - how much should I invest in each customer?
"Yes - there is a great deal of demand for data mining/predictive modeling people. Not only that, but there's competition between employers for the best talent & salaries are much better for heavy-duty quant people than they are for entry…"
"The answer is: No. No sample is guaranteed to be representative of the entire population, although the risk of non-representative samples is reduced as sample size / total N gets larger. The larger the % of the total population, the lower the…"