Missing data
- 1. MISSING DATA Reporting and Handling missing data DR HARDEV SINGH s/o HARPAL SINGH
- 2. HOW How to choose the techniques: • What the objectives to answer. • Ideas from literature review. • Expert opinion. • Feasibility to implement. Need tool(s) for technique(s) that you choose.
- 3. DATA COLLECTION TECHNIQUE Data collection techniques: • Interview (face-to-face/ telephone). • Self-administered questionnaire. • Instruments. • Recorded resources. • Observation.
- 4. VALIDITY & RELIABILITY Validity & reliability • Measure what you are supposed to measure. • Repeatable.
- 5. QUESTIONNAIRE Interview/ self-administered questionnaire: • If possible, use or modify a validated questionnaire • Should contain: • Identifier – avoid repetition & keep track of total distributed. • Introduction – purpose, confidentiality, use of data & patient’s agreement. • Socio-demographic information. • Main study questions. • Closing statements. • Short & precise; non-sensitive; simple language.
- 6. DATA COLLECTION FORM Recorded resources: • Data collection form. • Should contain: • Identifier – avoid repetition & keep track of total used. • Socio-demographic information. • Main study items. • Definition (terms/ units to use). • Test-retest/ inter-rater reliability
- 7. PILOT STUDY Pilot study: A small scale trial of a study technique. • Validity & reliability. • Limitations; time/ resource requirements. • Needs for revision.
- 8. DATA COLLECTORS Training for data collectors: • Supervisors: preferably who would have authority over data collectors. • Limit the number of data collectors to reduce errors. • Clear understanding of the study and methods. • Periodical checks to determine the quality of data.
- 9. EXCAMPLES
- 10. FOLLOW INSTRUCTIONS 1. ANALYZE 2. PILIH MISSING VALUE ANALYSIS (CLICK) CLICK ANALYZE PILIH MISSING VALUE ANALYSIS
- 11. HIGHLIGHT VARIABLE THE VARIABLES DROM SAME GROUPS 1. HIGHLIGHT VARIABLE YANG SATU GROUP DENGANNYA (CONTOH GROUP SIKAP) 2. CLICK DISINI
- 12. TRANSFER THE VARIABLE INTO QUANTITATIVE BOX VARIABLES
- 13. 1. CHOOSE EM 2. CLICK EM 3. CLICK OK
- 14. 1. CHOOSE SAVE COMPLETE DATA 2. INSERT NEW DATA SET (KEY IN NEW DATA NAME) 3. CLICK CONTINUE
- 15. 1. New data set will appear on the selected variable
- 16. NO MORE MISSING DATA BEFORE EM AFTER EM
- 17. CONCLUSION NEW DATA CAN BE INSERTED BY JUST COPY AND PASTE