Calculating Standard Deviation

numero = 298
interpreted = N
texte = I needed to do this for one of my hobby sites, so I thought I would share. Good if you have a scoring or ratings system on your site.

make sure that you have a tab on this line as indicated: sdev[index]<tab>[math][interpret][dev[index]][/interpret]*[interpret][dev[index]][/interpret][/math]

[!]<!-- The following code will find the standard deviation-->[/!][!]<!-- in a range of numbers stored in a database (or table),  -->[/!][!]<!-- where math.db is your database of scores                -->[/!][!]<!-- SAMPLE DATABASE:rating8565497156-->[/!][!]<!--Should yield a STANDARD DEVIATION of 2.22-->[/!][search db=math.db&neRATINGdatarq=[blank]][text show=F]numscores=[numfound][/text][founditems]Rating [index]=[text show=T]num[index]=[rating][/text]<br>[/founditems]Total: [text show=T]total=[sum field=rating][/text]<br>[/search]Avg: [text show=T]avg=[math][total]/[numscores][/math][/text]<br><hr>[loop start=1&end=[numscores]][text show=f]dev[index]=[math]([Interpret][num[index]][/Interpret]-[avg])*-1[/math][/text][/loop][table name=sdev&fields=sku,sdevnum][loop start=1&end=[numscores]]sdev[index]<tab>[math][interpret][dev[index]][/interpret]*[interpret][dev[index]][/interpret][/math][/loop][/table][search table=sdev&neskudatarq=[blank]][text show=f]devsum=[sum field=sdevnum][/text]<br>[/search][text show=f]ass=[math][devsum]/([numscores]-1)[/math][/text]Standard Deviation =[format .2f][math]sqrt([ass])[/math][/format]
I needed to do this for one of my hobby sites, so I thought I would share. Good if you have a scoring or ratings system on your site.

make sure that you have a tab on this line as indicated:
sdev[index]<tab>[math][interpret][dev[index]][/interpret]*[interpret][dev[index]][/interpret][/math]



[!]<!-- The following code will find the standard deviation-->[/!]
[!]<!-- in a range of numbers stored in a database (or table), -->[/!]
[!]<!-- where math.db is your database of scores -->[/!]
[!]<!--
SAMPLE DATABASE:
rating
8
5
6
5
4
9
7
1
5
6
-->[/!]
[!]<!--Should yield a STANDARD DEVIATION of 2.22-->[/!]

[search db=math.db&neRATINGdatarq=[blank]]
[text show=F]numscores=[numfound][/text]
[founditems]
Rating [index]=[text show=T]num[index]=[rating][/text]<br>
[/founditems]
Total: [text show=T]total=[sum field=rating][/text]<br>
[/search]
Avg: [text show=T]avg=[math][total]/[numscores][/math][/text]<br>
<hr>
[loop start=1&end=[numscores]]
[text show=f]dev[index]=[math]([interpret][num[index]][/Interpret]-[avg])*-1[/math][/text]
[/loop]
[table name=sdev&fields=sku,sdevnum]
[loop start=1&end=[numscores]]
sdev[index]<tab>[math][interpret][dev[index]][/interpret]*[interpret][dev[index]][/interpret][/math]
[/loop]
[/table]
[search table=sdev&neskudatarq=[blank]]
[text show=f]devsum=[sum field=sdevnum][/text]<br>
[/search]

[text show=f]ass=[math][devsum]/([numscores]-1)[/math][/text]
Standard Deviation =[format .2f][math]sqrt([ass])[/math][/format]
Gary Krockover

DOWNLOAD WEBDNA NOW!

Top Articles:

[biotype]

BioType is a behavioral biometrics WebDNA function based on ADGS research and development (from version 8...

WebDNA Libraries

A list of available libraries for WebDNA...

WebDNA reference

...

WebDNA Modules

A list of the currently available modules...

F.A.Q

A compilation of some user's questions...

Tips and Tricks

A list of user-submitted tips ...

Related Readings:

How old am I?

You want to express an age in years given the dob (mm/dd/yyyy) and today's date...

Hideif on IP range

This will show or hide stuff according to the IP...

Find duplicate records

Find duplicate records and do something with them...

Using a simple Array of Variables with [interpret]

The [interpret] context is very powerful command in the hands of a skilled WebDNA programmer...

How many working days?

This small script finds the number of working days between two dates...

reCAPTCHA code

reCAPTCHA helps prevent automated abuse of your site (such as comment spam or bogus registrations) by using a CAPTCHA to ensure that only humans perform certain actions...