haku: @freeterm instrumental variables / yhteensä: 3
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| Tekijä: | Bradlow, E. T. |
| Otsikko: | Encouragement designs: An approach to self-selected samples in an experimental design |
| Lehti: | Marketing Letters
1998 : NOV, VOL. 9:4, p. 383-391 |
| Asiasana: | Research Models |
| Vapaa asiasana: | Instrumental variables Randomized design Self-selection bias |
| Kieli: | eng |
| Tiivistelmä: | When subjects choose their own treatment many of the well-developed techniques of randomization-based experimental design and analysis are no longer applicable. With random assignment to treatment and control conditions, we can reasonable assume that over many replications, the two groups will be similar in all respects but that of receiving the treatment. With non-random assignment, it may be true that the groups differ on the variable of interest prior to receiving the treatment, and that a measured post-treatment difference (or lack thereof) will be erroneously attributed to the treatment. Our approach involves making all subjects aware of the availability of the treatment, but then offering extra encouragement (an encouragement design) to participate in the treatment to a randomly selected half of the population. |
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