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33811 - Dr Mona Hassan Ahmed Hassan Prof Biostatistics What...

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Unformatted text preview: Dr. Mona Hassan Ahmed Hassan Prof. Biostatistics What to do before sitting to PC? Statistical Software How to generate and interpret results? Data Coding Data Coding Transformation of qualitative information into Numbers OR Symbols Either the information is transferred from the original record to a “coding sheet” Ser. Ser. Ser. Column Code Column Code Column Code Age Age Age Sex Sex Sex MS MS MS Educ. Coding form Data Preparation Data Preparation ID 1 1. Date of Interview 10/1/2008 2. What is your date of Birth? 25/8/1986 3. What sex are you? Male (m) Female (f) 4. What is your marital status? Single (1) Married (2) Widowed (3) Divorced (4) 5. What is your height (cm)? 160 6. What is your weight (kg)? 58 Code 1 10/01/2008 25/08/1986 f 1 160 58 Coding by more than one person Coding by more than one person Precise instructions should be developed for coders Coders, must be trained check for inter-coder reliability Sorting of the questionnaires Sorting of the questionnaires 1-100 101-200 Describing the Sample measures of central tendency and variability . The appropriate measure of central tendency and variability will depend upon the variables level of measurement and the shape of the distribution. Scales of measurement Scales of measurement Interval Ratio Ordinal Nominal Ali Ramy Samy Scales of Measurement Scales of Measurement Nominal Symbols Assigned to Runners Ordinal Rank Order of Winners Interval Performance Rating on a 0 to 10 Scale Ratio Time to Finish, in 3 rd place 2 nd place 1 st place Finish Finish 3 7 9 15.2 14.1 13.4 Scale Basic...
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33811 - Dr Mona Hassan Ahmed Hassan Prof Biostatistics What...

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