PPV & NPV Across Target Groups: Prevalence Changes Everything (with a Chart)
This lesson is part of the course
In this lesson
You use natural frequencies per 10,000 people to calculate the PPV of the same stool test in five age bands and a symptom clinic, then chart how the PPV rises with prevalence.
Buy the course once for $9.99 to unlock every lesson and lab, the final exam and the certificate – lifetime access, no subscription.
Lessons in this course
- From Programme Data to a 2×2 Table: Sensitivity, Specificity, PPV & NPV Locked
- PPV & NPV Across Target Groups: Prevalence Changes Everything (with a Chart) Locked
- Choosing the Cut-off: ROC Points, Youden Index & Colonoscopy Capacity Locked
- Two-Stage Screening: Serial Testing & Combined Accuracy Locked
- Programme Yield: Detection Rate, Number Needed to Screen & Colonoscopies per Cancer Locked
- Uptake & Coverage by Group: Measuring Equity Gaps (with a Chart) Locked
- Cost per Case Detected & a Simple Cost per QALY Locked
- Lead-Time & Length-Time Bias, Interval Cancers & the False-Positive Burden Locked