The American Statistical Association’s store used to sell cool T-shirts with the old-time beggar-statistician question “Got Data?” Today it is much easier to find data, thanks to the Internet. Dozens of student teams taking my data mining course have been able to find data from various sources on the Internet for their team projects. Yet, I often receive queries from colleagues in search of data for their students’ projects. This is especially true for short courses, where students don’t have sufficient time to search and gather data (which is highly educational in itself!). One solution that I often offer is … Continue reading Got Data?!
While huge datasets have become ubiquitos in fields such as genomics, large datasets are now also becoming to infiltrate research in the social sciences. Data from eCommerce sites, online dating sites, etc. are now collected as part of research in information systems, marketing and related fields. We can now find social science research papers with hundreds of thousands of observations and more. A common type of research question in such studies is about the relationship between two variables. For example, how does the final price of an online auction relate to the seller’s feedback rating? A classic exploratory tool for examining such … Continue reading Scatter plots for large samples