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Researching Target Markets: Difference between revisions
→Later weeks: definition of w:quantile
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== Later weeks == | == Later weeks == | ||
In [[w:descriptive statistics|descriptive statistics]], the '''[[w:quartile|quartile]]s ''' of a [[w:Levels of measurement#Ordinal scale|ranked]] set of data values are the three points that divide the data set into four equal groups, each group comprising a quarter of the data. A quartile is a type of [[w:quantile|quantile]]. | * In [[w:descriptive statistics|descriptive statistics]], the '''[[w:quartile|quartile]]s ''' of a [[w:Levels of measurement#Ordinal scale|ranked]] set of data values are the three points that divide the data set into four equal groups, each group comprising a quarter of the data. A quartile is a type of [[w:quantile|quantile]]. | ||
* '''[[w:Quantile]]s''' are points taken at regular intervals from the [[w:cumulative distribution function|cumulative distribution function]] (CDF) of a [[w:random variable|random variable]]. | |||
*In [[w:statistics|statistics]] and [[w:probability theory|probability theory]], the '''[[w:standard deviation|standard deviation]]''' ('''SD''') (represented by the Greek letter sigma, '''[[w:Sigma|σ]]''') shows how much variation or [[w:tatistical dispersion|dispersion]] from the average exists. | *In [[w:statistics|statistics]] and [[w:probability theory|probability theory]], the '''[[w:standard deviation|standard deviation]]''' ('''SD''') (represented by the Greek letter sigma, '''[[w:Sigma|σ]]''') shows how much variation or [[w:tatistical dispersion|dispersion]] from the average exists. | ||