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Should the denominator of the Variance formula be n or (n-1)?

Posted on 10/14/14 at 12:07 am
Posted by euphemus
Member since Mar 2014
536 posts
Posted on 10/14/14 at 12:07 am


OR



Which is correct between the two?
Posted by Scruffy
Kansas City
Member since Jul 2011
72066 posts
Posted on 10/14/14 at 12:08 am to
288
Posted by mikrit54
Robeline
Member since Oct 2013
8664 posts
Posted on 10/14/14 at 12:09 am to
7.546
Posted by Spock's Eyebrow
Member since May 2012
12300 posts
Posted on 10/14/14 at 12:10 am to
One is population, the other sample...
Posted by tigersownall
Thibodaux
Member since Sep 2011
15319 posts
Posted on 10/14/14 at 12:10 am to
frick. Off
Posted by BayouBandit24
Member since Aug 2010
16572 posts
Posted on 10/14/14 at 12:12 am to
69
Posted by Slinky
Member since Dec 2013
3118 posts
Posted on 10/14/14 at 12:12 am to
The limit does not exist.
Posted by Scruffy
Kansas City
Member since Jul 2011
72066 posts
Posted on 10/14/14 at 12:12 am to
sqrt(-1)
Posted by tketaco
Sunnyside, Houston
Member since Jan 2010
19485 posts
Posted on 10/14/14 at 12:12 am to
Lonely Masturbators Board
Posted by TxTiger82
Member since Sep 2004
33939 posts
Posted on 10/14/14 at 12:13 am to
quote:

One is population, the other sample...


This. Probably you want the sample variance.
Posted by KosmoCramer
Member since Dec 2007
76519 posts
Posted on 10/14/14 at 12:14 am to
From a practical standpoint, if the n is large enough it doesn't matter.
Posted by Cap Crunch
Fire Alleva
Member since Dec 2010
54189 posts
Posted on 10/14/14 at 12:18 am to
n is population

n-1 is sample
Posted by LSUGent
Member since Jun 2011
2020 posts
Posted on 10/14/14 at 12:19 am to
im taking econometrics and I should know this

Im pretty positive its n-1
Posted by KosmoCramer
Member since Dec 2007
76519 posts
Posted on 10/14/14 at 12:21 am to
What would you say if I told you it was....both...?


Posted by Scruffy
Kansas City
Member since Jul 2011
72066 posts
Posted on 10/14/14 at 12:27 am to
quote:

What would you say if I told you it was....both...?
Posted by Pedro
Geaux Hawks
Member since Jul 2008
33459 posts
Posted on 10/14/14 at 12:29 am to
If its sample then n-1

Population is just n
Posted by ZacAttack
The Land Mass
Member since Oct 2012
6416 posts
Posted on 10/14/14 at 12:38 am to
n is for the population variance of the sample

n-1 eliminates bias if your mean is unknown

You can also have n+1, but it's been a couple of years since I had statistics and I dont really remember what that corrects for.
This post was edited on 10/14/14 at 12:42 am
Posted by Sentrius
Fort Rozz
Member since Jun 2011
64757 posts
Posted on 10/14/14 at 12:39 am to


Man, that shite looks like an alien language to me. But then again I suck at math so yes I'm a peasant.
Posted by SuperSaint
Sorting Out OT BS Since '2007'
Member since Sep 2007
140462 posts
Posted on 10/14/14 at 1:17 am to
Unfortunately even with this thread you can't even wooo Jet, so give it up bro
Posted by Eugene Dogwood
Baton Rouge
Member since Feb 2007
646 posts
Posted on 10/14/14 at 1:29 am to
"N"

Tempting

Won't fall for this again
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