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In order to calculate the average and standard deviation from aggregate data, it is necessary to have available for each group: the total of values (Σx i = SUM(x)), the number of values (N=COUNT(x)) and the total of squares of the values (Σx i 2 =SUM(x 2)) of each groups.
In both cases the key can take the form of an attribute, element, or computed value. The unique identifier is referred to as a key because of the use of the 'key' function to identify and track the group variable. The technique is not necessary in XSLT 2.0+, which introduces the new for-each-group tag.
Graphical examination of count data may be aided by the use of data transformations chosen to have the property of stabilising the sample variance. In particular, the square root transformation might be used when data can be approximated by a Poisson distribution (although other transformation have modestly improved properties), while an inverse sine transformation is available when a binomial ...
If we use a standard, rather than an actual mix of sizes and product varieties, the result is price per statistical unit. Statistical units are also called equivalent units. Average price per unit and prices per statistical unit are needed by marketers who sell the same product in different packages, sizes, forms, or configurations at a variety ...
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In practice, changes in the market value of assets (negative) or liabilities (positive) are recognized as losses while, for example, interest or charitable contributions are recognized as other expenses. Income is the term generally used when referring to revenue and gains together. A separate term for the aggregation of expenses and losses ...
Categorization is a type of cognition involving conceptual differentiation between characteristics of conscious experience, such as objects, events, or ideas.It involves the abstraction and differentiation of aspects of experience by sorting and distinguishing between groupings, through classification or typification [1] [2] on the basis of traits, features, similarities or other criteria that ...
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