Study Designs Clinical Research Population Ecological Studies Time

Study Designs Clinical Research Population Ecological Studies • Time trend • Migration study • Geographical correlation Generating hypothesis Case reports Case series Descriptive Longitudinal Individuals Cross Sectional Survey • Prevalence study • Analytical cross-sectional Testing hypothesis Observational Analytical • Cohort • Historical cohort Case-Control Study • Case-control • Nested-case control Observational study Experimental study Cohort Study Intervention • Equivalent trial • Non-inferior trial • Superior trial Clinical Trials Field Trials Community Trials

คำถามวจย และรปแบบและโครงสรางของงานวจย Prevalence, Mean value Risk factor, Prognostic factors, Natural history, Clinical course Sensitivity, Specificity, Predictive value, ROC curve Outcome research, Effectiveness, descriptive study cross sectional survey cohort study case-control cross-sectional analytical study Survival analysis diagnostic test study • randomized controlled trial • non-randomized controlled trial • cohort study

กระบวนการออกแบบการสมตวอยาง (Sampling Design Process) ��������� (Define Population) ��������� (Determine Sampling Frame( �������� )Determine Sampling Procedure( �������� ���� (Probability ����� (Non. Sampling) Probability Sampling) 1. - Simple Random 1. - Convenience 2. - Stratified 2. - Judgmental 3. - Systematic 3. - Quota ��������� 4. - Cluster 4. - Snowball ���� (Determine Appropriate Sample Size) ��������

Definition of Variables Conceptual Definition Operational Definition ความอวน ความฉลาด เปนโรคตบอกเสบบ Body mass index IQ HBS Ag+