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antidisestablishmentarianism


CAN'T. STOP. POSTING.

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Date: May 2, 2008
RE: random....
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aww

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someguyyouknow


Forum Postwhore

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Date: May 2, 2008
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HULK SMASH!!!

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Yo poster i'm really happy for you, Imma let you finish.
But Benn999 had one of the bes' post of all time.
One of the bes' posts of all time!
antidisestablishmentarianism


CAN'T. STOP. POSTING.

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Date: May 2, 2008
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that too.

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The Libertarian Party


Sports

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Date: May 5, 2008
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i bought a pair of pants that seem a little too tight. if anyone knows anyone that's roughly my height and a little thinner than myself then i will give the aforementioned pair of pants to the aforementioned person.

-- Edited by The Libertarian Party at 12:48, 2008-05-05

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T Square Man


Sports

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Posts: 3519
Date: May 5, 2008
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i bought a pair of pants, and then my dryer shrunk it, and now i can't walk in them without pinching my balls. You can have them if you want dave, should fit you.(unless my mom has other plans for them)

-- Edited by T Square Man at 13:43, 2008-05-05

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TheGalFromCal


Dependant Care Benefits

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Date: May 6, 2008
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ha i hate it when that happens D: j/k

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A signature? You mean like a time signature, right? Kay, how about 3/4?
someguyyouknow


Forum Postwhore

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Date: May 7, 2008
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**** the ****ing ****ers!

-- Edited by someguyyouknow at 02:17, 2008-05-07

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Yo poster i'm really happy for you, Imma let you finish.
But Benn999 had one of the bes' post of all time.
One of the bes' posts of all time!
The Libertarian Party


Sports

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Date: May 18, 2008
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I AM GOING INTO THE INTERNET. IF I'M NOT BACK IN 10 MINUTES, TELL MY WIFE THAT IF SHE HAD EXISTED THAT I LOVE HER VERY MUCH.

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TheGalFromCal


Dependant Care Benefits

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Date: May 18, 2008
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damn thats kinda scary

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A signature? You mean like a time signature, right? Kay, how about 3/4?
someguyyouknow


Forum Postwhore

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Date: May 18, 2008
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It's been 4hours 4 minutes he's either gone forever or he found a cat girl and doesn't wan't his wife to ever find out.

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Yo poster i'm really happy for you, Imma let you finish.
But Benn999 had one of the bes' post of all time.
One of the bes' posts of all time!
T Square Man


Sports

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Date: May 19, 2008
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i vote catgirl

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The Libertarian Party


Sports

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Date: May 19, 2008
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I'm Brittany's whore. what more do you want to know?
antidisestablishmentarianism


CAN'T. STOP. POSTING.

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Date: May 19, 2008
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lol awesome

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a_danielle


Bagger

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Date: May 20, 2008
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I love being random, it makes life random, YAY randomnessidea

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anissa krall
someguyyouknow


Forum Postwhore

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Date: May 20, 2008
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David is back and he brought king Lionitous with him. XD

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Yo poster i'm really happy for you, Imma let you finish.
But Benn999 had one of the bes' post of all time.
One of the bes' posts of all time!
T Square Man


Sports

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Posts: 3519
Date: May 20, 2008
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to be random is to be completely alksjd asdf=sd fjas l;dfaspldfnad



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INTERNET


Forum Dictator

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Date: May 20, 2008
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-- Edited by INTERNET at 21:59, 2008-05-20

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T Square Man


Sports

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Posts: 3519
Date: May 20, 2008
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the stock market in general is random

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someguyyouknow


Forum Postwhore

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Date: May 21, 2008
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nOT TURNING YOU CAPS LOCK OFF CAN BE RANDOM IF DONE RIGHT.

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Yo poster i'm really happy for you, Imma let you finish.
But Benn999 had one of the bes' post of all time.
One of the bes' posts of all time!
The Libertarian Party


Sports

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Posts: 3028
Date: May 23, 2008
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Bland-Altman plot

From Wikipedia, the free encyclopedia

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Bland-Altman plot
magnify-clip.png
Bland-Altman plot

In analytical chemistry and biostatistics, a Bland-Altman plot is a method of data plotting used in analysing the agreement between two different assays. It is identical to a Tukey mean-difference plot, which is what it is still known as in other fields, but was popularised in medical statistics by Bland and Altman.[1][2]

Contents

[hide]

[edit] Agreement vs correlation

Bland and Altman make the point that any two methods that are designed to measure the same parameter (or property) will have a good correlation when a set of samples are chosen such that the property to be determined vary a lot between them. A high correlation for any two methods designed to measure the same property is thus in itself is just a sign that one has chosen a wide spread sample. A high correlation does not automatically imply that there is good agreement between the two methods.

[edit] How to construct a Bland-Altman plot

Consider a set of n samples (for example, objects of unknown volume). Both assays (for example, different methods of volume measurement) are performed on each sample, resulting in 2n data points. Each of the n samples is then represented on the graph by assigning the mean of the two measurements as the abscissa (x-axis) value, and the difference between the two values as the ordinate (y-axis) value.

Hence, the Cartesian coordinates of a given sample S with values of S1 and S2 determined by the two assays is

S(x,y)=\left( \frac{S_1+S_2}{2},(S_1-S_2) <br>ight)

[edit] Application

One primary application of the Bland-Altman plot is to compare two clinical measurements that each provide some errors in their measure.[3] It can also be used to compare a new measurement technique or method with a gold standard even so the interest of the Bland-Altman plot is contested in this particular case because the error pertains to the sole new measure. See Analyse-it or MedCalc for software providing Bland-Altman plots.

[edit] References

  1. ^ Altman DG, Bland JM (1983). "Measurement in medicine: the analysis of method comparison studies". Statistician 32: 307-317. 
  2. ^ Bland JM, Altman DG (1986). "Statistical methods for assessing agreement between two methods of clinical measurement". Lancet 1 (8476): 307-10. 
  3. ^ Hanneman SK (2008). "Design, analysis, and interpretation of method-comparison studies". AACN Advanced Critical Care 19: 223-234.


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