The 2024 Legal Defense Fundraiser has ended early due to the Board's decision to settle the suit. Donations will go towards the creation of a legal defense fund. Discussion on the matter can be found at the RationalMedia Foundation noticeboard. Thank you for your generous support.

Information icon.svg Campaigning is open for the RationalWiki 2024 Board of Trustees election.

Experimenter bias

From RationalWiki
Jump to navigation Jump to search
Poetry of reality
Science
Icon science.svg
We must know.
We will know.
A view from the
shoulders of giants.
Warning icon orange.svg This page contains too many unsourced statements and needs to be improved.

Experimenter bias could use some help. Please research the article's assertions. Whatever is credible should be sourced, and what is not should be removed.

Experimenter bias is the introduction of any bias into the conclusions of an experiment due to the preconceptions or goals of the experimenter being made clear to participants in the study. The bias can be introduced at any stage of the experiment, from the construction of the experiment, the selection of subjects, the administration of the experiment, the analysis of the data, or the conclusions drawn.

This issue arises often in social and biological sciences, but only very rarely has it been noted in the history of the physical sciences.

Prevention

Experimenter bias stems from the deep-seated beliefs of an experimenter and is therefore difficult to prevent. Modern psychology generally supports the belief that is not possible to prevent experimenters from being biased, so it is necessary to design experiments in ways that bias cannot influence the results.

A great number of experimental methodologies are attempts to limit the unintentional introduction of experimenter bias. These include randomized controlled trials and double blind. Double-blind experiments are advisable whenever possible. In cases where measurements are recorded by human observers rather than by mechanical instruments, it is advisable to train people as observers who have little or no stake in the outcome of the experiment until their recorded observations correlate well on trials.

Minimizing interaction between the theorist(s) and experimental subjects to the barest minimum will limit the effects of bias, although this is not possible for all types of investigation.

Involvement in woo

Most experiments that purport to show evidence for psychic powers, alternative and quack medicine, or other woo fail to use proper methods and controls to limit experimenter bias. (For example, the doctor telling patients that homeopathy will work while failing to do so for the placebo). When replication attempts are made that do control for experimenter bias, the results are shown to be no better than chance.

See also

External links

References