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#1




How to calculate the power of a study ?
hey ppl plzzz help me out with this ......how to determine the power of a study ? ....how to calculate it?....i cant figure it out :O pllzzzzz helpppp!!!

#2




1  type II error
The power of a statistical test is the probability that the test will reject a false null hypothesis (i.e. that it will not make a Type II error). As power increases, the chances of a Type II error decrease. The probability of a Type II error is referred to as the false negative rate (β). Therefore power is equal to 1 − β, which is equal to sensitivity.

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Carolina_USMLE (12182014) 
#3




Don't confuse it with accuracy
The accuracy of the study is different.
It's calculated by the following formula: Accuracy = TP + TN / TP + FP + TN + FN 
#4




thxxxx sooo much for ur reply rasheed .....n plzzz can u explain it with an example

#5




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BiostatisticsEpidemiology 
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