Statistics Notes: Correlation, regression, and repeated data

[...]values of X and Y were generated for each "subject," then a further random number was added to make the individual "observation." The calculation is performed as if we have 25 subjects, and so the number of degrees of freedom for the significance test is increased incorrectl...

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Bibliographic Details
Published inBMJ Vol. 308; no. 6933; p. 896
Main Authors Bland, J M, Altman, D G
Format Journal Article
LanguageEnglish
Published London British Medical Journal Publishing Group 02.04.1994
BMJ Publishing Group LTD
Subjects
Statistics
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ISSN0959-8138
1468-5833
DOI10.1136/bmj.308.6933.896

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Summary:[...]values of X and Y were generated for each "subject," then a further random number was added to make the individual "observation." The calculation is performed as if we have 25 subjects, and so the number of degrees of freedom for the significance test is increased incorrectly and a spurious significant difference is produced.
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Correspondence to: Dr Bland.
PMID:8173371
ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 14
ISSN:0959-8138
1468-5833
DOI:10.1136/bmj.308.6933.896