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When a command is to be performed, the software obtains the data organization from column headings that are above the data. In essence, it generates the "schema" on demand. Popular commands are "Search" to make a subset, "Sort" to change the sequence of lines, "Totalize" to generate subtotals by type, category or date.
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.
Pivot tables are not created automatically. For example, in Microsoft Excel one must first select the entire data in the original table and then go to the Insert tab and select "Pivot Table" (or "Pivot Chart"). The user then has the option of either inserting the pivot table into an existing sheet or creating a new sheet to house the pivot table.
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To add a page to a category, include "[[Category:Category name]]" or "[[Category:Category name|Sortkey]]" in that page's wiki markup. The categories to which a page belongs appear in a box at the bottom of the page. A category is usually associated with a category page in the "Category:" namespace. [1]
Grouping articles into a category is not the same as making a list of articles. To edit a list of articles, you edit the list directly; but to place articles into a category, you edit an article and insert a category tag by placing [[Category:<category name>]] in the body of the text. This adds those articles as a list on the category's page.
The summary information consists of subtotals that are combined from previous rows within the same column. The concept of dimension is also a part of basic terminology. [ 7 ] Any "simple" table can be represented as a "multi-dimensional" table by normalizing the data values into ordered hierarchies .
On equipment, especially calculators, the lozenge is used to mark the subtotal key. It is standardized in ISO 7000 [ 7 ] as symbol ISO-7000-0650 ("Subtotal"). In a similar fashion, the square lozenge (⌑), part of the BCDIC character set, was often used on tabulation listings to indicate second level totals in banking installations in the 1960s.