piterbarg questions

piterbarg answers

• Roll up dataframe values into a cell above it
• Curvature when extrapolated using Natural Cubic Spline
• Sort pandas by Date, custom aggregator: combine all the data for each date
• Concatenate all combinations of sub-level columns in a pandas DataFrame
• How to get the distance between two geographic coordinates of two different dataframes?
• Get mean and mode of dataframe depending on each column type
• Print the colname and rowname for values that meet certain condition
• How to create a co-occurence matrix of product orders in python?
• Removing min, max and calculating average
• How to calculate Mean Absolute Error (MAE) and Mean Signed Error (MSE) using pandas/numpy/python math libray?