Summary ORGANISING AND VISUALISING VARIABLE

STATS
CHAPTER 2
ORGANISING AND VISUALISING VARIABLE:

TABULAR AND VISUAL SUMMARIES:
Enable rapid review of larger amounts of data.




SUMMARY TABLE:
- Tallies the frequencies or percentages of items in a set of categories so that you can
see differences between categories.

CONTINGENCY TABLES:
- Used to study patterns that may exist between the responses of two or more
categorical variables.
- Cross tabulates or tallies the responses of the categorical variables.




ORDERED ARRAY:
- Sequence of data, in rank order, from smallest value to largest value.
- Shows range (min value to max value)
- Helps identify outliers.

FREQUENCY DISTRIBUTION:
- Summary table – data arranged in numerically ordered classes.
- Must give attention to selecting the appropriate no of class groupings.
- No of classes depends on the number of values.
- To determine width of a class interval: divide range by no of class groupings.

, To accommodate continuous variables – square and rounded bracket used
- [square] inclusive
- (rounded) exclusive

VISUALISING CATEGORICAL DATA THROUGH GRAPHICAL DISPLAYS:




VISUALISING NUMERICAL DATA BY USING GRAPHICAL DISPLAYS: