WFM 5201: Data Management and Statistical Analysis © Dr. Akm Saiful Islam WFM 5201: Data Management and Statistical Analysis

Lecture-5: Data Exploration

Akm Saiful Islam Institute of Water and Flood Management (IWFM) Bangladesh University of Engineering and Technology (BUET)

April, 2008

WFM 5201: Data Management and Statistical Analysis © Dr. Akm Saiful Islam Data Exploration through Graphical Means        Bar diagram Pie chart Histogram Stem and Leaf Plot Frequency Plot Scatter diagram Line graph

WFM 5201: Data Management and Statistical Analysis © Dr. Akm Saiful Islam

Bar Diagram

 Vertical Bar Diagram  Horizontal Bar Diagram  Component Bar Diagram  Multiple Bar Diagram

WFM 5201: Data Management and Statistical Analysis © Dr. Akm Saiful Islam

Vertical Bar Diagram

Response Frequently Occasionally Rarely Never Frequency 49 71 24 6 Relative frequency 0.327

0.473

0.160

0.040

WFM 5201: Data Management and Statistical Analysis © Dr. Akm Saiful Islam

Horizontal bar diagram

WFM 5201: Data Management and Statistical Analysis © Dr. Akm Saiful Islam

Component Bar Diagram

Region A B Population in '000 Male Female 11228 17634 10637 16306 Percent of population Male Female 51.3

52.0

48.7

48.0

WFM 5201: Data Management and Statistical Analysis © Dr. Akm Saiful Islam

Multiple bar diagram

WFM 5201: Data Management and Statistical Analysis © Dr. Akm Saiful Islam

Pie Chat

 2D Pie Chart 3D Pie Chart

WFM 5201: Data Management and Statistical Analysis © Dr. Akm Saiful Islam

Histogram

WFM 5201: Data Management and Statistical Analysis © Dr. Akm Saiful Islam

Frequency Polygon

Expen.

4.5-9.5

9.5-14.5

14.5-19.5

19.5-24.5

24.5-29.5

Total No.

8 29 27 12 4 80

WFM 5201: Data Management and Statistical Analysis © Dr. Akm Saiful Islam

Scattered Diagram

Husband's age Wife's age Husband's age Wife's age Husband's age Wife's age 19 26 27 29 36 40 35 15 17 19 21 28 36 32 39 39 26 33 39 25 40 32 30 19 27 34 21 38 21 26 28 29 37 31 14 19 19 21 29 27 -

WFM 5201: Data Management and Statistical Analysis © Dr. Akm Saiful Islam

Scattered Diagram

WFM 5201: Data Management and Statistical Analysis © Dr. Akm Saiful Islam

Line Diagram

Year 1901 1911 1921 1931 1941 1951 1961 1974 1981 1991 Population 28.9

31.6

33.2

35.6

42.0

44.2

55.2

76.4

89.9

111.5