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English translation: biased

GLOSSARY ENTRY (DERIVED FROM QUESTION BELOW)
English term or phrase:nonrandom (non-random)
Selected answer:biased
Entered by: luskie

07:24 May 27, 2008
English language (monolingual) [PRO]
Social Sciences - Mathematics & Statistics
English term or phrase: nonrandom disappearance of certain of its members
what does it mean "the control group has been contaminated by the nonrandom disappearance of certain of its members"
pfchen
Local time: 15:20
biased
Explanation:
this means that the disappeared subjects did not disappea regardless of their characteristcs - they were for example more males than females, or the oldest or the youngest ones, etc. - for this reason, after these defeats, the control group characteristics were biased (a bias being a systematic error), i.e. they were no more randomly ditributed - hence the control group was no more comparable with the experimental or treatment group
Selected response from:

luskie
Local time: 09:20
Grading comment
thank you very much for detailed explanation!
4 KudoZ points were awarded for this answer



SUMMARY OF ALL EXPLANATIONS PROVIDED
4 +2biased
luskie
4some members quit, not in a natural, random way
orientalhorizon


  

Answers


9 mins   confidence: Answerer confidence 4/5Answerer confidence 4/5 peer agreement (net): +2
nonrandom disappearance of certain
biased


Explanation:
this means that the disappeared subjects did not disappea regardless of their characteristcs - they were for example more males than females, or the oldest or the youngest ones, etc. - for this reason, after these defeats, the control group characteristics were biased (a bias being a systematic error), i.e. they were no more randomly ditributed - hence the control group was no more comparable with the experimental or treatment group

luskie
Local time: 09:20
Works in field
Native speaker of: Native in ItalianItalian
PRO pts in category: 4
Grading comment
thank you very much for detailed explanation!

Peer comments on this answer (and responses from the answerer)
agree  Egil Presttun
3 mins

agree  orientalhorizon: "biased" is a very good word here.
7 mins
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17 mins   confidence: Answerer confidence 4/5Answerer confidence 4/5
some members quit, not in a natural, random way


Explanation:
Some members quit the group, maybe intentionally eliminated or as a result of some other human interferences, therefore, the control group will lose its representativeness and cannot be used as an ideal control group any more.

orientalhorizon
Local time: 15:20
Works in field
Native speaker of: Native in ChineseChinese
PRO pts in category: 4
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