I would like to calculate the slope in linear regression fashion. It should be a column formula. And the slope value should be single value (Averaged) for the below table.
| Group | Subgroup | Log[V] | Log[T3] | Slope |
| 1 | a | 1.609438 | 7.953736 | Calculate slope for 1, a |
| 1 | a | 1.648659 | 6.777461 |
| 1 | a | 1.686399 | 5.296072 |
| 1 | b | 1.609438 | 8.953736 | Calculate slope for 1, b |
| 1 | b | 1.648659 | 7.777461 |
| 1 | b | 1.686399 | 6.296072 |
| 2 | a | 1.609438 | 17.95374 | Calculate slope for 2, a |
| 2 | a | 1.648659 | 16.77746 |
| 2 | a | 1.686399 | 15.29607 |
| 2 | b | 1.609438 | 38.95374 | Calculate slope for 2, b |
| 2 | b | 1.648659 | 37.77746 |
| 2 | b | 1.686399 | 36.29607 |