Hello,
I am new in Stata. I would appreciate your help.
I want to delete all observations except the last one in each month. So, I want the last observation of jan/1927, the last observation of feb/1927 and so on.
Example:
Anyone know how to do it?
Thank you
I am new in Stata. I would appreciate your help.
I want to delete all observations except the last one in each month. So, I want the last observation of jan/1927, the last observation of feb/1927 and so on.
Example:
| permno | date | retl | retw | id | newid | retwl |
| 11789 | 31/jan/27 | -.4911771 | .4012769 | 9 | 1 | .892454 |
| 10073 | 31/jan/27 | -.3965825 | .4692593 | 10 | 1 | .8658419 |
| 10647 | 31/jan/27 | -.5990365 | .6592593 | 11 | 1 | 1.258296 |
| 11519 | 31/jan/27 | -.6194447 | .5867956 | 12 | 1 | 1.20624 |
| 14330 | 31/jan/27 | -.6279929 | .4129298 | 16 | 1 | 1.040923 |
| 12802 | 28feb1927 | -.2189815 | 4.511984 | 60 | 2 | 4.730966 |
| 12722 | 28feb1927 | -.4094577 | 4.613336 | 61 | 2 | 5.022793 |
| 10639 | 28feb1927 | -.4542338 | 4.86881 | 62 | 2 | 5.323044 |
| 12984 | 28feb1927 | -.4171968 | 5.503687 | 63 | 2 | 5.920884 |
| 15245 | 28feb1927 | -.3505301 | 5.536296 | 64 | 2 | 5.886826 |
| 10524 | 28feb1927 | -.3341367 | 5.697093 | 65 | 2 | 6.031229 |
| 15413 | 28feb1927 | .2658634 | 5.809214 | 66 | 2 | 5.54335 |
| 13581 | 28feb1927 | .5158634 | 5.804429 | 67 | 2 | 5.288566 |
| 10209 | 28feb1927 | .5207414 | 5.806482 | 68 | 2 | 5.285741 |
| 12263 | 28feb1927 | .8022228 | 5.867244 | 69 | 2 | 5.065022 |
| 10647 | 31/mar/27 | -.4090909 | .0978261 | 70 | 3 | .506917 |
| 12984 | 31/mar/27 | -.5400433 | .1848749 | 71 | 3 | .7249182 |
| 10399 | 31/mar/27 | -.7493456 | .0289498 | 72 | 3 | .7782953 |
| 12722 | 31/mar/27 | -.6905221 | .0153443 | 73 | 3 | .7058664 |
| 15413 | 31/mar/27 | -1.065522 | .0075924 | 74 | 3 | 1.073114 |
| 11690 | 31/mar/27 | -1.080015 | .0763285 | 75 | 3 | 1.156343 |
| 12634 | 31/mar/27 | -1.100848 | .297037 | 76 | 3 | 1.397885 |
Anyone know how to do it?
Thank you
