I have a dataset like this. Each patient has multiple admissions and cost corresponding to that admission in a particular year, and either falls in sample a or sample b. the variable ' months' gives the number of months that the patient is alive in that year. So, I calculate the average monthly cost as total cost/total months. So, for sample a, the average cost is 200/6 and for sample b, the average cost is 210/14. How do I apply t-test to check if these two means are statistically different?
| PT_ID | Cost | subsample | months |
| 1 | 20 | a | 4 |
| 1 | 30 | a | 4 |
| 1 | 40 | a | 4 |
| 2 | 10 | b | 6 |
| 2 | 20 | b | 6 |
| 2 | 30 | b | 6 |
| 3 | 50 | a | 2 |
| 3 | 60 | a | 2 |
| 4 | 70 | b | 8 |
| 4 | 80 | b | 8 |
Regards,
Ishwarya
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