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05.02A · Cours 2 — Statistiques descriptives

Course 2 — Descriptive statistics

Course and questions · 54 pages

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1Descriptive Statistics2Session Objectives3Clinical Studies Overview4Statistical Analysis Goals
Types of Variables
5Qualitative vs Quantitative6Ratio vs Interval Scales7Questionnaire Example
Qualitative & Discrete Variables
8Frequency Table9Bar Chart10Pie Chart
Cross-Tabulation
11Frequency by Group12Grouped Bar Chart13Reversed Cross-Table14Reversed Bar Chart
Continuous Quantitative Variables
15Histogram16Mean (Central Tendency)17Standard Deviation (Dispersion)18Median — Definition19Median — Calculation Example20Percentiles & Quartiles21Quartiles on Histogram22Percentile Interpretation23Box Plot — Structure24Box Plot vs Histogram
Comparing Two Groups
25Overlaid Histograms26Side-by-Side Box Plots27Scatter Plot
Association & Clinical Research
28Description by Study Design29Definition of Association30Measures of Association
Clinical Study Examples
31Overview of Examples32RCT 1: AR101 Peanut Allergy — PICO33RCT 1: Baseline Characteristics34RCT 1: Outcome Results35RCT 1: Effect Size Measures36RCT 2: PHYS-STROKE — PICO37RCT 2: Baseline Characteristics38RCT 2: Outcome Box Plots39RCT 2: Mean Difference Result40Cross-Sectional: Swissnoso Setup41Cross-Sectional: Prevalence by Age42Case-Control: Aspergillosis Setup43Case-Control: Baseline by Outcome44Case-Control: Risk Factor Logic45Cohort: Covid Vaccine & Preterm Birth46Cohort: Baseline & Confounding47Cohort: Outcome & Weak Association
48Other Graphical Methods49Other Measures of Association50Description Is Not Proof
Summary
51What Description Achieves52Methods Depend on Variable Type
53Conclusions54Next Session Preview