1.2 Collection, Presentation, and Organization of Data
1.2.1 Types of Data
1.2.2 Sources of Data
Primary: Obtained directly (not collected from someone else)
Secondary: Using pre-collected data from someone else/some organization
Example (Guess Types)
- A researcher buys data from BMD to build a model of rainfall behavior
- A researcher runs an experiment to measure speed of light using a novel technique.
- A researcher makes use of the data generated by the one in example 2
1.2.3 Method of Data Collection
Direct personal Inquiry
Indirect oral inquiry
- Each method has its own advantages and disadvantages;
1.2.4 Sources of Secondary Data
- Published: Scientific Journals, Newspapers etc.
- Unpublished: BBS, WHO, IMF, FAO, ICDDR,B
1.2.5 Disadvantages of Secondary Data
- Purpose might be different
1.2.7 Data Classification
- Inclusive vs exclusive
What does it tell us
1.2.10 Histogram Intervals
Can these intervals be readily used?
(5-10); (10-15); (15-20)
(5-9); (10-14); (15-20)
If not, what should we do?
1.2.11 Stem and Leaf
- key in stem and leaf plot
- How to interpret stem and leaf plot
## ## The decimal point is 1 digit(s) to the right of the | ## ## 0 | 1 ## 1 | 0246 ## 2 | 0567 ## 3 | 0
1.2.12 How to interpret cf and rf
1.2.13 What Ogives tell us
1.2.14 Bar vs Pie
- When to use which?
- How to calculate angles?
- Can we draw on 180 degrees?
1.2.15 Choose Diagram