gibbz00 questions

• Efficient way to perform running total in the last 365 day window
• Tracking full Level change row by row
• Fetching a score associated with a date 'Around' 7 days ago
• Double Sapply nested function
• Calculating time spent in a given level when that level changes
• Rank most recent scores of students within a given date - 30 days window
• Check if a value exists using multiple conditions within group in pandas
• Count cumulative unique factors separated by semicolon Grouped by Name
• Fastest way for doing 21 day rolling sum for an ActivityType
• Get the last row of a previous group in data.table

gibbz00 answers