Type 1, 2, 3 of Errors in Research

Type II error refers to the acceptance of the null hypothesis in a study when the null hypothesis is actually incorrect

Type I error occurs when the null hypothesis is rejected although it is true

Type III error occurs when the null hypothesis is rejected but the wrong assumptions are used

Random error is defined as errors that occur in experimental measurements secondary to unknown and unpredictable changes in the experimental conditions

Variance error is defined as all sources of variability in an experiment that are not subject to investigation.

References

Harvey BJ, Lang TA. Hypothesis testing, study power, and sample size. Chest. 2010;138:734-737.

Wuensch K. Type III errors. Available at
http://core.ecu.edu/psyc/wuenschk/stathelp/Type_III.htm

Exell RHB. Random vs systematic error. Available at http://www.physics.umd.edu/courses/Phys276/Hill/Information/Notes/ErrorAnalysis.html

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