Specificity is descriptive of a test. It describes the probability that the test will correctly not detect a diagnostic marker in a patient where it is truly absent. Calculating statistical specificity can be done in 3 simple steps. Sensitivity and specificity are often explained together. I think this is mostly done by convention even thoughContinue reading “Statistics: How to Calculate Specificity in 3 Steps”
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Statistics: How to Calculate Sensitivity
To perform a diagnostic test we take body samples and measure the presence and quantity of a specific substance. We then compare that value to standardized ranges to help rule in or rule out the presence of pathology. One way we do this is by calculating sensitivity. A diagnostic test is accurate when: This doesContinue reading “Statistics: How to Calculate Sensitivity”
Statistics: How to Calculate Absolute and Relative Risk
You will often encounter ratio calculations in medical literature. It is a calculation of probability. Ratio calculations include absolute risk, absolute risk reduction, absolute risk increase, number needed to treat and relative risk. Risk calculations are especially useful in cohort studies and randomized controlled trials where selected patients are observed over period of time toContinue reading “Statistics: How to Calculate Absolute and Relative Risk”
Ratio Data: How to Analyze Statistics in Medical Literature
Statistics can seem daunting but they cannot be avoided in medical research. If we don’t understand statistical concepts, like ratio data, we are at the mercy of the author’s conclusions. While there are guidelines and peer review processes that help to maintain the integrity of how studies are conducted or reported, there are gaps. PerhapsContinue reading “Ratio Data: How to Analyze Statistics in Medical Literature”