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Error in standard deviation calculation
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- Dieses Thema hat 3 Antworten sowie 2 Teilnehmer und wurde zuletzt vor vor 19 Jahren, 7 Monaten von Norbert Bakkers aktualisiert.
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19.10.2005 um 00:26 Uhr #34103Norbert BakkersTeilnehmer
When converting a standard deviation calculation (from the statistics menu) into a formula I noticed the following:
The first part of the formula consists of ‘SQRT(n/(n-1))’, should this not be ‘SQRT(1/(n-1))’?19.10.2005 um 00:26 Uhr #34106Norbert BakkersTeilnehmerWhen converting a standard deviation calculation (from the statistics menu) into a formula I noticed the following:
The first part of the formula consists of ‘SQRT(n/(n-1))’, should this not be ‘SQRT(1/(n-1))’?19.10.2005 um 20:38 Uhr #34104Bernhard KantzTeilnehmerThe formula is correct. The standard deviation can be written in to forms. One uses a factor 1/(n-1) and the other one a factor n/(n-1). If you convert the first formula into the second formula, you make use of the equation Sum(X) = n * Mean(X). This is where the factor n comes in.
20.10.2005 um 21:57 Uhr #34105Norbert BakkersTeilnehmerThank you for the explanation, it makes perfect sense now. I also made a formula using the standard deviation equation I know and they did indeed give identical results
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