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بسم الله الرحمن الرحيم

بسم الله الرحمن الرحيم. Graphical Presentation. Dr. Laila Mohamed Nofal Professor of Biostatistics High Institute of Public Health University of Alexandria. Graphical Presentation. Graphical presentation is the use of a graph to show the distribution of data. Why ?.

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بسم الله الرحمن الرحيم

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  1. بسم الله الرحمن الرحيم

  2. Graphical Presentation Dr. Laila Mohamed Nofal Professor of Biostatistics High Institute of Public Health University of Alexandria

  3. Graphical Presentation Graphical presentation is the use of a graph to show the distribution of data. Why ? • Attract the reader’s attention • A graph or diagram, provides an easily understood picture of the data. A suitable diagram is easier to grasp and leaves a more permanent impression of the main features of the data • To compare two or more distributions.

  4. There are many varieties of graphs. The use of a particular type depends on: Type of data (quantitative continuous or discrete or qualitative) Type of table (simple or complex) Graphical Presentation

  5. Line Graph = Trend Line • One quantitative variable & Time. • Time may be years, months, weeks, days, hours…) • No frequency distribution. • May be one or more quantitative variables bytime.

  6. The Line Graph Example:

  7. The Line Graph Figure (1) Crude birth rate of Country X 1997-2001

  8. Figure (1) Crude birth rate of Country X 1997-2001

  9. The Line Graph

  10. Histogram • For quantitative continuous variables • S.F.D.T only

  11. Example:

  12. Example: Age in Years Figure (2): Distribution of patients by age in Hospital X, 2011

  13. Frequency Polygon • Quantitative continuous variable • SFDT or Complex FDT

  14. Frequency Polygon • SFDT • Points are joined by straight line

  15. Frequency Polygon • Complex FDT • Points are joined by straight line

  16. Distribution of a group of patients by age

  17. Distribution of a group of patients by age

  18. Example: Frequency Polygon

  19. Figure (3): Distribution of patients by age and sex in Hospital X, 2012

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