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Quick Scroll PSM formulae's (one-by-one) 01.09.06 (2 years ago) #1
let add PSM formulae one-by-one.......
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Quick Scroll Odds ratio 01.09.06 (2 years ago) #2
Odds ratio= TP x TN / FP x FN
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Quick Scroll sensitivity & specificity 01.09.06 (2 years ago) #3
sensitivity= TP
____ x 100
TP+FN



specificity = TN
_____ x 100
TN + FP
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Quick Scroll 01.09.06 (2 years ago) #4
sensitivity= (TP / TP+FN) x 100



specificity = (TN /TN + FP) x 100
[/b]
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Quick Scroll prior probability / percent prevalence 01.09.06 (2 years ago) #5
prior probability / percent prevalence

= (TP+FN) x 100/(TP+FN+FP+TN)
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Quick Scroll positive preditive value & negative predictive value 01.09.06 (2 years ago) #6
Positive Preditive Value = (TP/TP+FP) x 100


&


Negative Predictive Value = (TN/TN+FN) x 100
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Quick Scroll variance 01.09.06 (2 years ago) #7
Variance = ( S.D.)2 = (S.D)square
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Quick Scroll S.D. 01.09.06 (2 years ago) #8
1 S.D. = 68.3%

2 S.D. = 95.4%

3 S.D. = 99.7%

____________________________________________

NEW S.D. = Multifying Factor x OLD S.D.

_____________________________________________

S.D. = squareroot[sum(x-x')square / n ]

x' = mean

n = no of values

x = individual values
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Quick Scroll Z score 01.09.06 (2 years ago) #9
Z score is the relative deviate / std normal deviate

Z score = ( Observed value -Mean value ) / S.D.
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Quick Scroll 07.17.07 (1 year ago) #10
Relative risk=Ie/Ine
Attributable risk=[Ie-Ine]/Ie
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