_Normdist ( z ; mu ; sigma )
Rate this function: Average rating: 4.7 (31 votes)
Discuss this Custom Function
Mislav Kos, Soliant Consulting
FileMaker implementation of NORMDIST Excel function
|( 100; 100; 15 )
( 90 ; 100; 15 )
( 70 ; 100; 15 )
( 130; 100; 15 )
Compare to Excel
To provide a near equivalent of the NORMDIST Excel function, for when its "cumulative" parameter is set to true.
The cumulative probability that the observed value of a normal random variable with mean mu and standard deviation sigma will be less than or equal to parameter z.
This custom function requires the _Normsdist ( z ) custom function.
This custom function is a FileMaker implementation of the NORMDIST function in Excel.
Caution: This custom function is ONLY AN APPROXIMATION of the Excel function;
i.e. it will calculate an approximate answer rather than the exact answer.
(Note: The same is true of the Excel function.)
The results are accurate to several decimal places, which is typically sufficient for most uses.
Also see the custom function _Normsdist ( z ).
The difference between NORMDIST and NORMSDIST:
- NORMSDIST applies to standard normal distribution.
- NORMDIST applies to any normal distribution.
- A standard normal distribution has a mean of 0 and a standard deviation of 1.
The calculation was adapted from http://www.wilmott.com/messageview.cfm?catid=8&threadid=78622.
Here are some notes on the NORMDIST Excel function from http://support.microsoft.com/kb/827371:
- The normal distribution is a continuous probability distribution whose shape is determined by its mean, mu, and standard deviation, sigma.
- The normal distribution with mean mu and standard deviation sigma is centered at mu and has half of its probability to the left of mu and half to the right.
- The /standard/ normal distribution is the special case where mu = 0 and sigma = 1.
- The probability is distributed according to the familiar bell-shaped curve with the total area under the curve equal to 1.
- The probability that a value that is less than or equal to z will occur (also called cumulative probability up to z) is the area under this curve to the left of z.
- In NORMDIST, when the last argument is set to TRUE, NORMDIST returns the cumulative probability that the observed value of a Normal random variable with mean mu and standard deviation sigma will be less than or equal to z.
Note: these functions are not guaranteed
or supported by BrianDunning.com. Please contact the individual
developer with any questions or problems.
This is my Custom Function and I want to
There are no comments yet. Be the first to post a comment about this Custom Function! Please try to keep it brief & to the point. Anyone can post:
Newest Custom Functions:
||(Sat, Jun 16, 1:55pm)
||httpResponseCode ( responseHeaders )
||(Tue, Jun 12, 10:40pm)
||FindDuplicateCharacters ( string )
||(Fri, Jun 08, 5:01pm)
||FieldRepetitionLast ( field ; maxRepetition )
||(Wed, Jun 06, 6:05pm)
||CountModifiedRecords ( NameTimestampField ; StartTimestamp ; EndTimestamp )
||(Mon, May 28, 8:23am)
||JSONArrayLength ( JSONArrayStr )
||(Fri, May 25, 7:46am)
||interpolation (y1; y2; y3; x1; x2; x3; x1y1; x2y1; x1y2; x2y2; rnd)
||(Sat, May 19, 3:55am)
||@JSONFormatElements ( json )
||(Tue, May 15, 3:31am)