How to Calculate...
P-values
- P-values and Type I ErrorTerry Shaneyfelt (5 min video)
Number Needed to Treat
- How to Calculate the Number Needed to TreatTerry Shaneyfelt (3 min video)
- The NNT TutorialGrahm Walker (4 min video)
- Number Needed to TreatPhillip Sedgewick. BMJ 2010;341:c5614
Absolute Risk Reduction, Relative Risk Reduction, Relative Risk
- How to Calculate Relative RiskTerry Shaneyfelt (3 min video)
- Basic Statistics for Clinicians: Assessing the Effects of Treatment: Measures of AssociationCMAJ. 1995 Feb 1;152(3):351-7. Erratum in: Can Med Assoc J 1995 Mar 15;152(6):813.
Odds Ratios
- How to Calculate an Odds RatioTerry Shaneyfelt (3 min video)
- Odds RatiosPhilip Sedgwick. BMJ 2010;341:c4414
Intention-to-Treat
- Intention-to-Treat Analysis: What It Is and Why Is It Important?Terry Shaneyfelt (5 min video)
- What is Intention-to-Treat Analysis?Allan Shaughnessy (1 min video)
- What is the Intention-to-Treat Analysis?Philip Sedgewick BMJ 2013;346:f3662
Forest Plots
- How to Interpret a Forest PlotTerry Shaneyfelt (5 min video)
- Interpreting and Understanding Meta-Analysis Graphs: A Practical GuideAust Fam Physician. 2006 Aug;35(8):635-8. PubMed PMID: 16894442
Confidence Intervals
- Confidence IntervalsTerry Shaneyfelt (5 min video)
- Basic Statistics for Clinicians: Interpreting Study Results: Confidence IntervalsCMAJ. 1995 Jan 15;152(2):169-73.
Sensitivity, Specificity and Likelihood ratios
- Sensitivity & SpecificityH. Gilbert Welch (8 min video). The Dartmouth Institute for Health Policy & Clinical Practice.
- How to Calculate SensitivityTerry Shaneyfelt (4 min video)
- How to Calculate SpecificityTerry Shaneyfelt (3 min video)
- What are Likelihood Ratios and How Are They UsedTerry Shaneyfelt (10 min video)
More
Sources for Likelihood Ratio
- Diagnosis (LR) ReviewsIncludes interactive nomogram.
JAMAevidence Calculators
- JAMAevidence CalculatorsCovers therapy, harm and diagnosis. Requires Flash Player.
EBP Calculators
BMJ Statistical Notes series by DG Altman
Grimes and Schulz series on statistics in Lancet
Guide Information
Last Updated: Feb 22, 2024 3:18 PM
URL: https://libguides.pcom.edu/ebp_tutorial