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EPIDEMIOLOGY
CLASSIFICATION OF
STATISTICAL DATA
• According to Nature
  Quantitative data
  Qualitative Data
• According to Source
  Primary data
  Secondary data
CLASSIFICATION OF
STATISTICAL DATA
• According to Arrangement
  Ungrouped data
  Grouped Data
• According to measurement
  Discrete data
  Continuous data
PRESENTATION OF STATISTICAL
DATA
• Tabular form
   Reference purpose or general
   Special purpose or text
• Bar charts
   Subdivided
   Multiple
• Pie diagram
• Time series line graph
PRESENTATION OF STATISTICAL
DATA
• Pareto chart
• Histogram
• Ogive
• Lorenz curve
SOURCES OF DATA
  Primary                Secondary                      Tertiary
 Autobiographies                                      Abstracts
 correspondence        Biographies                    bibliographies
 descriptions of       prior books & papers on a chronologies
 travel                topic                          classifications
 diaries               literary criticism &           dictionaries &
 literary works        interpretation                  encyclopaedia
 interviews            history & historical criticism directories
 personal narratives   political analyses             guidebooks and manuals
 paintings and         reviews of law and             population registers
 photographs           legislation                    statistics
                       essays on morals and ethics
                       analyses of social policy
                       study and teaching material
SAMPLING
• It is concerned with the selection of a subset of
  individuals from within a population to estimate
  characteristics of the whole population.
• Researchers rarely survey the entire population
  because the cost of a census is too high.
• The three main advantages of sampling are that
  the cost is lower, data collection is faster, and
  since the data set is smaller it is possible to
  ensure homogeneity and to improve the
  accuracy and quality of the data.
METHODS OF SAMPLING
• Simple random
• Systematic
• Stratified
• Cluster
• Probability proportional to size
• Quota sampling
• Accidental
• Line-intercept
• Panel

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Epidemiology

  • 2. CLASSIFICATION OF STATISTICAL DATA • According to Nature Quantitative data Qualitative Data • According to Source Primary data Secondary data
  • 3. CLASSIFICATION OF STATISTICAL DATA • According to Arrangement Ungrouped data Grouped Data • According to measurement Discrete data Continuous data
  • 4. PRESENTATION OF STATISTICAL DATA • Tabular form Reference purpose or general Special purpose or text • Bar charts Subdivided Multiple • Pie diagram • Time series line graph
  • 5. PRESENTATION OF STATISTICAL DATA • Pareto chart • Histogram • Ogive • Lorenz curve
  • 6. SOURCES OF DATA Primary Secondary Tertiary Autobiographies Abstracts correspondence Biographies bibliographies descriptions of prior books & papers on a chronologies travel topic classifications diaries literary criticism & dictionaries & literary works interpretation encyclopaedia interviews history & historical criticism directories personal narratives political analyses guidebooks and manuals paintings and reviews of law and population registers photographs legislation statistics essays on morals and ethics analyses of social policy study and teaching material
  • 7. SAMPLING • It is concerned with the selection of a subset of individuals from within a population to estimate characteristics of the whole population. • Researchers rarely survey the entire population because the cost of a census is too high. • The three main advantages of sampling are that the cost is lower, data collection is faster, and since the data set is smaller it is possible to ensure homogeneity and to improve the accuracy and quality of the data.
  • 8. METHODS OF SAMPLING • Simple random • Systematic • Stratified • Cluster • Probability proportional to size • Quota sampling • Accidental • Line-intercept • Panel