Difference between revisions of "Documentation/How Tos/Calc: DSTDEV function"

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== DSTDEV  ==
 
== DSTDEV  ==
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: returns the sample standard deviation of the weights of children in the second grade. This is not a useful measure, as there are so few children.
 
: returns the sample standard deviation of the weights of children in the second grade. This is not a useful measure, as there are so few children.
  
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===Issues:===
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* The OOo2.3 Help implies that <tt>'''0'''</tt> as a <tt>'''field'''</tt> will include the entire database table. This seems to be wrong - only the standard deviation of a single column can be found.
  
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* Logical values TRUE and FALSE are interpreted as 1 and 0 in the calculation. This is not compatible with Excel, which ignores logical values. This will very rarely cause difficulty.
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* [[Documentation/How_Tos/Calc: DCOUNT function|DCOUNT]]
 
* [[Documentation/How_Tos/Calc: DCOUNT function|DCOUNT]]
 
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* [[Documentation/How_Tos/Calc: Functions listed alphabetically|Functions listed alphabetically]]
 
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[[Category: Documentation/Reference/Calc/Database functions]]
==Issues==
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* The OOo2.3 Help implies that <tt>'''0'''</tt> as a <tt>'''field'''</tt> will include the entire database table. This seems to be wrong - only the standard deviation of a single column can be found.
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* Logical values TRUE and FALSE are interpreted as 1 and 0 in the calculation. This is not compatible with Excel, which ignores logical values. This will very rarely cause difficulty.
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Latest revision as of 13:09, 30 January 2024



DSTDEV

Returns the sample standard deviation of values in a column of a Calc 'database' table, in rows which meet specified criteria.


Syntax:

DSTDEV(database_table; field; criteria_table)

where

database_table is a range defining the data to be examined.
field is the column to examine. It may be a column number (1 is the first column of the database table, 2 is the second ...) or a column header (enclosed in quotation marks ””) or a cell referring to a column header.
criteria_table is a range containing criteria, which are used to select which rows of the database_table to examine.


The Database functions overview describes these parameters in detail.


DSTDEV returns the sample standard deviation, which assumes that the chosen rows of the database_table contain a random sample of a normally distributed population. If the chosen data are the entire population, use * DSTDEVP instead. The DSTDEV calculation uses this formula:

Calc sample stddev formula.png

where N is the number of values included and xi are those values.


DSTDEV ignores any cell containing text in the field column.


Simply put, standard deviation is a measure of how widely spread data values are. It is the square root of the variance (see * DVAR, * DVARP). Standard deviation is a reliable measure only if there is enough data to examine.


Example:

In this spreadsheet:

  A B C D E
1 Name Grade Age Distance to School Weight
2 Andy 3 9 150 40
3 Betty 4 10 1000 42
4 Charles 3 10 300 51
5 Daniel 5 11 1200 48
6 Eva 2 8 650 33
7 Frank 2 7 300 42
8 Greta 1 7 200 36
9 Harry 3 9 1200 44
10 Irene 2 8 1000 42
11          
12          
13 Name Grade Age Distance to School Weight
14   2      


DSTDEV(A1:E10; "Weight"; A13:E14)

returns the sample standard deviation of the weights of children in the second grade. This is not a useful measure, as there are so few children.

Issues:

  • The OOo2.3 Help implies that 0 as a field will include the entire database table. This seems to be wrong - only the standard deviation of a single column can be found.
  • Logical values TRUE and FALSE are interpreted as 1 and 0 in the calculation. This is not compatible with Excel, which ignores logical values. This will very rarely cause difficulty.



See Also
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