Context This subset was created to be useful for further analysis of the DonorsChoose.org challenge. We keep only the first and second donation to facilitate analysis of conversion rate from first to second donation. Content The columns are the same from the original. We only keeps donations from donators who donated twice. These donations were included only if they include the first donation from the donor (Donor.Cart.Sequence == 1). Inspiration This was created with being the most useful for future machine learning analysis. Working with lighter datasets also enables researchers with access to only basic computation devices.