Difference between revisions of "Documentation/How Tos/Calc: CHISQDIST function"
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=== Example === | === Example === | ||
| − | <tt>'''CHSQDIST(2. | + | {| |
| − | : returns approximately 0 | + | |- |
| + | |<tt>'''CHSQDIST(2.3;15;FALSE())'''</tt> | ||
| + | : returns approximately 0,000209862 | ||
| − | <tt>'''CHSQDIST(2. | + | <tt>'''CHISQDIST(2.3;2;FALSE())'''</tt> |
| − | : returns approximately 0. | + | :returns approximately 0,158318385 |
| + | |||
| + | |[[Image:ChiDistributionDensity.png|Graphs of Chi-distribution density functions]] | ||
| + | |} | ||
| + | |||
| + | {| | ||
| + | |- | ||
| + | |<tt>'''CHSQDIST(1.5;2;TRUE())'''</tt> | ||
| + | : returns approximately 0,5276334 | ||
| + | other valid call: <tt>'''CHSQDIST(1.5;2)'''</tt> | ||
| + | |[[Image:ChiDistributionCumulativeLeftTail.png|Chi-distribution cumulative functions]] | ||
| + | |} | ||
| + | |||
| + | {| | ||
| + | |- | ||
| + | |<tt>'''CHSQDIST(18;15;TRUE())'''</tt> | ||
| + | : returns approximately 0,73733444 | ||
| + | |[[Image:ChiDistributionLeftTailArea.png|Area under density function]] | ||
| + | |||
| + | [[Image:ChiDistributionCumulativeMarked.png|Chi-distribution with marked point]] | ||
| + | |} | ||
=== Remarks === | === Remarks === | ||
Revision as of 23:55, 6 December 2008
This function is not yet implemented but expected for OpenOffice.org version 3.1.
CHISQDIST
Calculates values for a χ2-distribution.
Syntax
CHISQDIST(x; k; Cumulative)
- x is the number, at which you will evaluate the χ2-distribution.
- k sets the degrees of freedom for the χ2-distribution
- Constraint: k must be a positive integer
- Cumulative is a logical value.
- In the case Cumulative=TRUE() the cumulative distribution function is used, in the case Cumulative=FALSE() the probability density function. This parameter is optional. It is set to TRUE() if missing.
Semantic
CHISQDIST(x;k;FALSE()) returns values of the probability density function for the χ2-distribution:
CHISQDIST(x;k;TRUE()) returns the left tail probability for the χ2-distribution:
Example
CHSQDIST(2.3;15;FALSE())
CHISQDIST(2.3;2;FALSE())
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CHSQDIST(1.5;2;TRUE())
other valid call: CHSQDIST(1.5;2) |
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CHSQDIST(18;15;TRUE())
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Remarks
If you need CHISQDIST(x;k;TRUE()) with a non integer parameter k, then use GAMMADIST(x;k/2;2) instead.
For to get the right tail for large values x, do not calculate 1-CHISQDIST. It is less accurate in those cases than using CHIDIST. CHISQDIST(x;k;TRUE()) + CHIDIST(x;k) = 1.
In the density case the internal calculation uses logarithmic- and exponential function, if x >1425 or x · k > 1391000. The results are less accurate in those cases.
See also:
CHISQINV, LEGACY.CHIDIST, LEGACY.CHIINV, CHITEST
Functions listed alphabetically, Functions listed by category
Issues:
This function is not available in version 3.0 and earlier.
