English, Article edition: CID: Stata module to calculate confidence intervals for means or differences Patrick Royston

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Bookmark: http://trove.nla.gov.au/version/101895
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  • code
Language
  • English

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Title
  • CID: Stata module to calculate confidence intervals for means or differences
Author
  • Patrick Royston
Physical Description
  • code
Notes
  • cid calculates confidence intervals (CIs) for means or differences. In the first form, cid calculates a CI for the mean of varname. In the second form, cid produces a CI for mean difference between varname1 and varname2. Data are assumed to be paired, but unpaired changes this assumption. In the third form, cid gives a CI for the mean difference across the two groups defined by groupvar. Data are assumed paired, but unpaired reverses this. median calculates CI's as above, except for medians rather than for means. CI's are determined by rank-based methods as described in Gardner and Altman's (1989) book "Statistics with Confidence", pp. 74-79. A normal approximation with a continuity correction of 0.5 is used, rather than tables of exact values. The accuracy should be adequate when both groups have at least 5 observations.
  • RePEc:boc:bocode:s338001
Language
  • English
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