Hello, I want to convert the transactional data below into a matrix to count the frequency of DIFFERENT days the customer made orders.
I'm basically trying to figure out, based on transactional data for 2 years. How many different days a customerID has made purchases.
For example, Customer ID 17850 has frequency of 1 in the data set below (it purchased different items during that day as you can see in the transactional data).
I'm trying TABULATE, but not sure how to come up with rows of single customerIDs and the frequency (based on unique days).
Example of Tabulation outcome (based on unique dates, not on ROWS!):
| Customer ID | Frequency |
| 17850 | 45 |
| 13047 | 30 |
| … | … |
PS: I attach the excell with transactional data
| InvoiceNo | StockCode | Description | Quantity | InvoiceDate | UnitPrice | CustomerID | Country |
| 536365 | 85123A | WHITE HANGING HEART T-LIGHT HOLDER | 6 | 1/12/2010 8:26 | 2.55 | 17850 | United Kingdom |
| 536365 | 71053 | WHITE METAL LANTERN | 6 | 1/12/2010 8:26 | 3.39 | 17850 | United Kingdom |
| 536365 | 84406B | CREAM CUPID HEARTS COAT HANGER | 8 | 1/12/2010 8:26 | 2.75 | 17850 | United Kingdom |
| 536365 | 84029G | KNITTED UNION FLAG HOT WATER BOTTLE | 6 | 1/12/2010 8:26 | 3.39 | 17850 | United Kingdom |
| 536365 | 84029E | RED WOOLLY HOTTIE WHITE HEART. | 6 | 1/12/2010 8:26 | 3.39 | 17850 | United Kingdom |
| 536365 | 22752 | SET 7 BABUSHKA NESTING BOXES | 2 | 1/12/2010 8:26 | 7.65 | 17850 | United Kingdom |
| 536365 | 21730 | GLASS STAR FROSTED T-LIGHT HOLDER | 6 | 1/12/2010 8:26 | 4.25 | 17850 | United Kingdom |
| 536366 | 22633 | HAND WARMER UNION JACK | 6 | 1/12/2010 8:28 | 1.85 | 17850 | United Kingdom |
| 536366 | 22632 | HAND WARMER RED POLKA DOT | 6 | 1/12/2010 8:28 | 1.85 | 17850 | United Kingdom |
| 536367 | 84879 | ASSORTED COLOUR BIRD ORNAMENT | 32 | 1/12/2010 8:34 | 1.69 | 13047 | United Kingdom |
| 536367 | 22745 | POPPY'S PLAYHOUSE BEDROOM | 6 | 1/12/2010 8:34 | 2.1 | 13047 | United Kingdom |
| 536367 | 22748 | POPPY'S PLAYHOUSE KITCHEN | 6 | 1/12/2010 8:34 | 2.1 | 13047 | United Kingdom |
| 536367 | 22749 | FELTCRAFT PRINCESS CHARLOTTE DOLL | 8 | 1/12/2010 8:34 | 3.75 | 13047 | United Kingdom |
| 536367 | 22310 | IVORY KNITTED MUG COSY | 6 | 1/12/2010 8:34 | 1.65 | 13047 | United Kingdom |
| 536367 | 84969 | BOX OF 6 ASSORTED COLOUR TEASPOONS | 6 | 1/12/2010 8:34 | 4.25 | 13047 | United Kingdom |
| 536367 | 22623 | BOX OF VINTAGE JIGSAW BLOCKS | 3 | 1/12/2010 8:34 | 4.95 | 13047 | United Kingdom |
| 536367 | 22622 | BOX OF VINTAGE ALPHABET BLOCKS | 2 | 1/12/2010 8:34 | 9.95 | 13047 | United Kingdom |
| 536367 | 21754 | HOME BUILDING BLOCK WORD | 3 | 1/12/2010 8:34 | 5.95 | 13047 | United Kingdom |
| 536367 | 21755 | LOVE BUILDING BLOCK WORD | 3 | 1/12/2010 8:34 | 5.95 | 13047 | United Kingdom |
| 536367 | 21777 | RECIPE BOX WITH METAL HEART | 4 | 1/12/2010 8:34 | 7.95 | 13047 | United Kingdom |
| 536367 | 48187 | DOORMAT NEW ENGLAND | 4 | 1/12/2010 8:34 | 7.95 | 13047 | United Kingdom |
| 536368 | 22960 | JAM MAKING SET WITH JARS | 6 | 1/12/2010 8:34 | 4.25 | 13047 | United Kingdom |
| 536368 | 22913 | RED COAT RACK PARIS FASHION | 3 | 1/12/2010 8:34 | 4.95 | 13047 | United Kingdom |
| 536368 | 22912 | YELLOW COAT RACK PARIS FASHION | 3 | 1/12/2010 8:34 | 4.95 | 13047 | United Kingdom |
| 536368 | 22914 | BLUE COAT RACK PARIS FASHION | 3 | 1/12/2010 8:34 | 4.95 | 13047 | United Kingdom |
| 536369 | 21756 | BATH BUILDING BLOCK WORD | 3 | 1/12/2010 8:35 | 5.95 | 13047 | United Kingdom |
| 536370 | 22728 | ALARM CLOCK BAKELIKE PINK | 24 | 1/12/2010 8:45 | 3.75 | 12583 | France |
| 536370 | 22727 | ALARM CLOCK BAKELIKE RED | 24 | 1/12/2010 8:45 | 3.75 | 12583 | France |
| 536370 | 22726 | ALARM CLOCK BAKELIKE GREEN | 12 | 1/12/2010 8:45 | 3.75 | 12583 | France |
| 536370 | 21724 | PANDA AND BUNNIES STICKER SHEET | 12 | 1/12/2010 8:45 | 0.85 | 12583 | France |
| 536370 | 21883 | STARS GIFT TAPE | 24 | 1/12/2010 8:45 | 0.65 | 12583 | France |