data processing and analysis first step data check 1. omission- missed information. 2....
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Data Processing and analysis
• First Step
• data check
1. Omission- missed information.
2. Inconsistencies- non conformity of same information obtained by different sources or in different ways.
3. Improbabilities- illogical data.
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• 2nd step
Prepare a Master Table
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Master sheet
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Variable view
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• 3rd Step
tabulate data and prepare uni-variate, bi-variate and multivariate table or graph.
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variable Birth weight
<2500
no.(%)
2500
no.(%)
Total(%)
Occupation
House wife 87(18.7) 228
(49)
315(87.7)
Service 21(4.5) 128(27.5) 149(32)
Business 0(.0) 1(0.2) 1(0.2)
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General principle for Table
• 1. the table should be numbered e.g Table-1• 2. Title• 3. heading for colums and raws.• 4. Percentages, placed as close as possible.• 5. size• 6. footnotes• 7. vertical arrangements.
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• For large data- 5-20 groups.
• class interval should be equal.
• Classes should be mutually exclusive and not overlapping.
• open ended class- avoided
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Criteria for Bar Chart• 1. The space separating the bars should
not exceed the width of the bar and should not less than half of the width.
• 2. Should neither be exceedingly long and narrow or short and broad.
• 3. Vertical bar chart is an effective way for presenting a time series and qualitatively classified data.
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• 4. Horizontal bars are useful for graphical or spatial distribution.
• 5. The data when do not relate to time, should be arranged in ascending or descending order before charting.