Difference between revisions of "Documentation/How Tos/Calc: NORMSDIST function"
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<tt>'''NORMDIST(0; 0; 1; 1)'''</tt> | <tt>'''NORMDIST(0; 0; 1; 1)'''</tt> | ||
: also returns 0.5. | : also returns 0.5. | ||
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| + | === Issues: === | ||
| + | * The forthcoming international standard ODFF regards this as a legacy function, preferring <tt>'''NORMDIST'''</tt>. | ||
| + | * The accuracy is insufficient for x < −2. The error will hopefully be fixed in OOo3.2. You should use the equation | ||
| + | :<tt>NORMSDIST(x) = 0.5 * ERFC(-x/SQRT(2))</tt> for x < −2. | ||
| + | :The function [[Documentation/How_Tos/Calc: ERFC function|ERFC]] belongs to the category ''Add-in''. | ||
{{Documentation/SeeAlso| | {{Documentation/SeeAlso| | ||
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* [[Documentation/How_Tos/Calc: Functions listed alphabetically|Functions listed alphabetically]] | * [[Documentation/How_Tos/Calc: Functions listed alphabetically|Functions listed alphabetically]] | ||
* [[Documentation/How_Tos/Calc: Functions listed by category|Functions listed by category]]}} | * [[Documentation/How_Tos/Calc: Functions listed by category|Functions listed by category]]}} | ||
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Revision as of 16:24, 2 March 2009
NORMSDIST
Calculates values for the cumulative distribution function of a normal distribution.
Syntax:
NORMSDIST(x)
- The standard normal distribution is a normal distribution with mean μ = 0 and standard deviation σ = 1.
- NORMSDIST calculates the cumulative distribution function of the standard normal distribution.
- It is equivalent to NORMDIST(x; 0; 1; 1).
Example:
NORMSDIST(0)
- returns 0.5. The standard normal distribution curve is centred on 0, hence half of the curve is below 0.
NORMDIST(0; 0; 1; 1)
- also returns 0.5.
Issues:
- The forthcoming international standard ODFF regards this as a legacy function, preferring NORMDIST.
- The accuracy is insufficient for x < −2. The error will hopefully be fixed in OOo3.2. You should use the equation
- NORMSDIST(x) = 0.5 * ERFC(-x/SQRT(2)) for x < −2.
- The function ERFC belongs to the category Add-in.
