Related Experiment Video

Updated: May 23, 2026

Inverse Probability of Treatment Weighting (Propensity Score) using the Military Health System Data Repository and National Death Index
06:55

Inverse Probability of Treatment Weighting (Propensity Score) using the Military Health System Data Repository and National Death Index

Published on: January 8, 2020

[Publication bias--the Achilles' heel of medical research]

Riitta Luoto1

  • 1UKK-instituutti ja Terveyden ja hyvinvoinnin laitos.

Duodecim; Laaketieteellinen Aikakauskirja
|April 11, 2012
PubMed

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Confirmation Biases

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Ideally, the people who observe and record the children’s behavior are unaware of who was assigned to the experimental or control group, in order to control for experimenter bias. Experimenter bias refers to the possibility that a researcher’s expectations might skew the results of the study. Remember, conducting an experiment requires a lot of planning, and the people involved in the research project have a vested interest in supporting their hypotheses. If the observers knew which child was...
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