Hi
For the evaluation of a ranking algorithm I would like to calculate the average precision. The calculation should be done for each row, but refers to the sum of the previous rows:
Given the existence of the Rank and Hit colum, how can I calculate the Precision?
Is there a chance to pass on a value from one row to the next?
Any help or hint is very appreciated!
Christian
For the evaluation of a ranking algorithm I would like to calculate the average precision. The calculation should be done for each row, but refers to the sum of the previous rows:
| Rank | Hit | Precision |
| 1 | 1 | 1/1 = 1 |
| 2 | 0 | (1+0)/2 = 0.5 |
| 3 | 0 | (1+0+0)/3 = 0.33 |
| 4 | 1 | (1+0+0+1)/4 = 0.5 |
| 5 | 0 | (1+0+0+1+0)/5 = 0.4 |
Given the existence of the Rank and Hit colum, how can I calculate the Precision?
- With Calculator and Formula it seems that I only can calculate values from the same row.
- With Group By it seems that I only can can calculate values for all rows of the whole stream? With the "Cumulative Sum" of Group by I could calculate the precision of the last row, but actually I need it on every row.
Is there a chance to pass on a value from one row to the next?
Any help or hint is very appreciated!
Christian