diagrammatic summary of research methodology, ethics & statistics
DESCRIPTION
A diagrammatic summary of three presentations given for the UQU Medical Research Club "Your Journey Towards Research: Writing Research Proposal" held at King Abdullah Medical City, Makkah. May 17, 2012. Presentations summarized include: 1. Research Methodology 2. Research Ethics 3. StatisticsTRANSCRIPT
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Diagrammatic Summary of1. Research Methodology2. Ethical Considerations
3. Statistical Considerations“The Journey Towards Your Research Project:
Writing Research Proposal”
Sohail Bajammal, MBChB, MSc, FRCS(C), PhD(c)Assistant Professor of Orthopaedics, Umm Al-Qura University
Director of CME & Research Administration, King Abdullah Medical City Makkah
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Research
Doing
Using
Research Methodology
EBM
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EBM (evidence-based clinical practice)
Clinical Circumstances
Research Evidence
Patients’ Preferences
Clinical Expertise
Haynes et al. BMJ 2002;324:1350@bajammal
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EconomicLegal
Therapy
Perspectives of ResearchThink Broad!
Basic Science Social
Diagnosis
Prognosis
Clinical
Health Problem“Trauma”
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Research Methodology Phases
Planning
Conducting
Publishing
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Research Problem
Research Question
Research Design
Data Collection
Data Analysis
Research Dissemination@bajammal
Methodological, Ethical &
Statistical Considerations at Each Stage
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Research Question
Truth in the Universe
Target Population
Phenomena of interest
Study Plan
Truth in the Study
Intended Sample
Intended variables
Actual Study
Findings in the Study
Actual subjects
Actual measurements
From Hulley et al. Designing Clinical Research. LWW
Design Implement
InferInfer
ErrorsErrors
Physiology of ResearchPatho
Internal ValidityExternal Validity@bajammal
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@bajammal
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Sampling
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Case-Control Studies
Cases(e.g., Lung Cancer)
Control(e.g., NO Lung
Cancer)
GO BACK IN TIME
GO BACK IN TIME
Ask patientsRead files
Shisha Smokers
NOT Shisha Smokers
Shisha Smokers
NOT Shisha Smokers
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Prospective Cohort
Shisha Smokers
NOT Shisha Smokers
Follow Up
Follow Up
Lung Cancer
No Lung Cancer
Lung Cancer
No Lung Cancer
Methodologically sound, but Unethical
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Randomized Controlled Trial (RCT)
Patients with MI RANDOM
Drug A
Drug B
F/U
F/U
Outcomes
Outcomes
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bioethics.kacst.edu.sa
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NationalityGender
Stage I, II, III & IV cancer
Pulse(0 is dead)
Temperature(0 is not zero)
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Measures of Central Tendency
Type of VariableBest measure of
central tendency
Nominal Mode
Ordinal Median
Interval/ratio(not skewed)
Mean
Interval/ratio(skewed)
Median
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68 % of observations
95 % of observations
99.7 % of observations
STANDARD DEVIATIONS
-3 -2 -1 0 1 2 3
MEAN
Courtesy of Prof. Hassan Baaqeel
Normal Distribution
1 SD
2 SD
3 D
Parametric
Tests
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Choice of Statistical Tests
GoalInterval/Ratio(normal distribution)
1. Ordinal2. Interval/Ratio
(skewed)Nominal
Comparison of 2 unrelated groups Unpaired t-test Mann-Whitney U
Chi-square TestComparison of >2 unrelated ANOVA Kruskal-Wallis H
Comparison of 2 related groups Paired t-test Wilcoxon
Binomial Sign TestComparison of >2 related groups
Repeated measures ANOVA Friedman
Correlation Pearson’s Spearman’s rho Chi-square Test
Parametric Tests
Non-Parametric Tests
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Hypothesis Testing (α & β errors)
Results in the Study Sample
Truth in the Population
Association Between Predictor & Outcome
No Association Between Predictor & Outcome
Reject null hypothesis Correct Type I error (α)
Fail to reject null hypothesis Type II error (β) Correct
Null Hypothesis: No association between predictor & outcome
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