ID DATE DIST 1 04/21/15 244 1 04/21/15 320 1 05/20/15 400 1 05/20/15 390 2 04/21/15 260 2 04/21/15 310 3 04/20/15 280 3 04/20/15 320 3 05/19/15 380 3 05/19/15 410   How can I create a dataset with an average of a variable (DIST) by ID and Date from the dataset above The final dataset should look like the following   ID DATE DIST 1 04/21/15 282 1 05/20/15 395 2 04/21/15 285 3 04/20/15 300 3 05/19/15 395 ... View more