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Validation measures include:
Kappa - measures the level of agreement
between two data sources, measured on a binary scale (e.g., Disease
Present/Disease Absent). The
kappa statistic corrects for the possibility of agreement due to
chance.
Sensitivity - the percentage of true positives
an algorithm detects among all positive disease cases. Positive
disease cases are survey respondents in the CCHS validation cohort
who reported having the specified disease.
Specificity - the percentage of true negatives
an algorithm detects among all the negative disease cases. Negative
disease cases are survey respondents in the CCHS validation cohort
who did not report having the specified disease.
Positive predictive value (PPV) - the percentage of
individuals with a positive result for an algorithm among those who
reported having the disease.
Negative predictive value (NPV) - the percentage of
individuals with a negative result for an algorithm who did not
report having the disease.
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