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Accuracy???!!!


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4 replies to this topic

#1 Prep!

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Posted 03 November 2009 - 09:21 PM

Hi all.. i ve got a crazy (may be even stupid) doubt all of a sudden (this happens when u analyse thousaunds of data :) )
I desire a certain amount A (i have added this component suppose its units is mg/ml)
I get the value from assay as B (from the graph equation again in mg/ml)
If i do B/A, the percentage of it is Accuracy... and 100-the answer is the inaccuracy!!!
If I do A/B, what does the answer signify???
Thanx.. hope i dint cinfuse!!! :lol:
Support bacteria - They are the only culture some people have!!!
Cheers!!!

#2 Prep!

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Posted 03 November 2009 - 10:43 PM

suppose i did an ELISA
my standard was 2.5,5,10,25,50 ng/ml.
I plot a graph of the resopnse
i back calculate from the graph equation (linear or 4PL)
for 5 ng/ml standard, i get a value of 4 ng/ml
so the accuracy by which i could detect the standard (in other terms %recovery) is 4/5*100=80%. So the inacuracy is 20%
Now the inverse that is 5/4*100 is 125%. What does this value signify!!!
I hope its clear now!!!
Support bacteria - They are the only culture some people have!!!
Cheers!!!

#3 Prep!

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Posted 04 November 2009 - 01:49 AM

To further simplify
value obtained/value desired*100. This gives acuracy
I wanted to ask what will value desired/value obtained give!!!
Both give different results... So the confusion!!!
Support bacteria - They are the only culture some people have!!!
Cheers!!!

#4 rick112

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Posted 05 November 2009 - 09:12 PM

To further simplify
value obtained/value desired*100. This gives acuracy
I wanted to ask what will value desired/value obtained give!!!
Both give different results... So the confusion!!!


..hi..
:unsure: warning:not an expert just putting across wht i feel about this:

does'nt it signifies "bias" in the data,???

#5 Prep!

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Posted 05 November 2009 - 09:15 PM

hi rick... long time

ya it actually describes the error % in the data.. so was just wondering if we can relate it to accuracy!!!
if i have no spike control.. and suppose its only the standard... wat term wud we give this value?? accuracy% (over or under-watever)?? or error% - bias in your terms!!!
Support bacteria - They are the only culture some people have!!!
Cheers!!!




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