Section outline

  • LGD: Continuous Tests

    ROC Curves, multilevel  likelihood ratios and the relationship between them; how dichotmozing tests wastes information; the Walking Man approach to ROC curves; choosing cutoffs

    Faculty:  Michael Kohn

    • Lecture Slides:

    • Multilevel_tests_Lecture_2020.1001.pptx File
    • MultiLevelAndContinuousTestsExcelDemo.xlsx File

      This version has one sheet for demo and one with the formulas

    • Lecture Audio/Video Recording (Access restricted to registered students):

    • Lecture 3 Segment 1 -- Multilevel Tests -- Why not make the test dichotomous? (13:34) Media Resource
      Not available unless: You belong to Registered students only
    • Lecture 3 Segment 2 -- the ROC Curve (17:45) Media Resource
      Not available unless: You belong to Registered students only
    • Lecture 3 Segment 3 -- Interval Likelihood Ratios (22:34) Media Resource
      Not available unless: You belong to Registered students only
    • Lecture 3 Segment 4 -- What test result should prompt treatment? (11:29) Media Resource
      Not available unless: You belong to Registered students only
    • Lecture 3 Segment 5 -- computer-drawn ROC curves (33:30) Media Resource
      Not available unless: You belong to a group in Registered Students Only
    • 2020 (!) Zoom Recording of Large Group Discussion 10/6/2020 (1:31:00) Media Resource

      0:00 – Intro set up

      3:00 – Michael: Review of material covered in the first 4 segments

      10:45 – Michael: “Walking Man” approach to understanding computer-drawn ROC curves

      46:30 – Student questions

      1:03:30 – Tom: problem on using BNP to diagnose peripartum congestive heart failure (CHF)

      Includes a detailed discussion of a published ROC table and why NOT to report LR(+) and LR(-) at each of multiple cutoffs.

      Not available unless: You belong to Registered students only

    • Large Group Discussion (Access restricted to registered students):
      Brief formal review of lecture followed by question and answer discussion. Recorded lecture should be viewed prior to this session.

    • Zoom Recording of Large Group Discussion (Access restricted to registered students):

    • Large Group Discussion Zoom Recording 10/5/2021 Audio and Shared Screen Only Media Resource

      I tried downloading the Zoom recording that includes only the shared screen and audio, not the gallery of faces.  It's a bit odd because, when I'm not sharing my screen, there is no video. 

    • Required Reading:

    • EBD-2, Chapter 3

    • Optional Reading:

    • M.A. Kohn, Key concepts in clinical epidemiology: reporting on the accuracy of continuous tests, Journal of Clinical Epidemiology, https:// doi.org/ 10.1016/ j.jclinepi.2021.07.012 File
      Not available unless: You belong to Registered students only

    • Assignments:  Problem Set #3, Multi-level Tests

    • Problem set #3 File

    • Assignment Due Date: 10/07/21 at 1:15 PM

    • Problem Set #3 Assignment

    • Assignment Answer Key (Access restricted to registered students):

    • PSet #3 Answer Key File
      Not available unless: You belong to Registered students only