| 000 | 00944 a2200241 4500 | ||
|---|---|---|---|
| 005 | 20250512044128.0 | ||
| 264 | 0 | _c19880518 | |
| 008 | 198805s 0 0 eng d | ||
| 022 | _a0002-9262 | ||
| 024 | 7 |
_a10.1093/oxfordjournals.aje.a114891 _2doi |
|
| 040 |
_aNLM _beng _cNLM |
||
| 100 | 1 | _aGray-Donald, K | |
| 245 | 0 | 0 |
_aCausality inference in observational vs. experimental studies. An empirical comparison. _h[electronic resource] |
| 260 |
_bAmerican journal of epidemiology _cMay 1988 |
||
| 300 |
_a885-92 p. _bdigital |
||
| 500 | _aPublication Type: Comparative Study; Journal Article; Research Support, Non-U.S. Gov't; Review | ||
| 650 | 0 | 4 | _aEpidemiologic Methods |
| 650 | 0 | 4 | _aHumans |
| 650 | 0 | 4 | _aRandom Allocation |
| 700 | 1 | _aKramer, M S | |
| 773 | 0 |
_tAmerican journal of epidemiology _gvol. 127 _gno. 5 _gp. 885-92 |
|
| 856 | 4 | 0 |
_uhttps://doi.org/10.1093/oxfordjournals.aje.a114891 _zAvailable from publisher's website |
| 999 |
_c3288192 _d3288192 |
||