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Manuals/calci/AVEDEV
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Revision as of 06:31, 26 November 2013
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06:31, 26 November 2013
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#To find the deviation of each value, subtract all numbers with its mean value.
#To find the deviation of each value, subtract all numbers with its mean value.
#Then find the average deviation, add all the deviation values and divide by the total number of given numbers.
#Then find the average deviation, add all the deviation values and divide by the total number of given numbers.
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*The formula to calculate Average deviation is:
<math>Average Deviation =\sum_{i=1}^{n} \frac{xi-\bar{x}}{n}</math>
<math>Average Deviation =\sum_{i=1}^{n} \frac{xi-\bar{x}}{n}</math>
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*The <math>\chi^2</math> test first calculates a <math>\chi^2</math> statistic using the formula:
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<math>\chi^2 = \sum_{i=1}^{columns} \sum_{j=1}^{rows} \frac{(observed ij-expected ij)^{2}}{grand total}</math>
*Here <math>xi</math> is the observation.
*Here <math>xi</math> is the observation.
*<math>\bar{x}</math> is the mean.
*<math>\bar{x}</math> is the mean.
Abin
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