Looks like no one added any tags here yet for you.
What is screening?
testing for a disease in persons who are not otherwise suspected to have the disease
Sensitivity
proportion of those with disease who test positive
Sensitivity =
TP / (TP + FN)
Specificity
proportion of those without disease who test negative
Specificity =
TN / (TN + FP)
Positive Predictive Value (PPV)
proportion of positive tests that actually have disease
Positive Predictive Value (PPV) =
TP / (TP + FP)
Negative Predictive Value (NPV)
proportion of negative tests that are actually disease free
Negative Predictive Value (NPV) =
TN / (TN + FN)
When the prevalence of a disease is higher in a population, what can be expected for the proportion of false-positives?
The proportion will be lower
Validity
the legitimacy of the measurements
Reliability
the consistency of the measurements
True or False. You can have validity without reliability.
False
True or False. You can be reliable without validity.
True
Operationalization
the process of strictly defining variables into measurable factors, especially when measurement uses an ordinal scale
What are the four things you might consider when choosing how to conduct a survey?
1. Who administers the survey?
2. How much does the survey use cost?
3. Is the survey acceptable?
4. How stable is survey reliability?