4VL Graphical representation of data

Question 1

How can data be represented graphically?

Answer 1

1. Bar charts
2. Line charts
3. Histogram
4. Box­plots
5. and many more…

Question 2

What graphes need to do?

Answer 2

Graphs need to:
▪ Be easily understandable & clearly labelled, i.e. are all axis
labelled, is there a title?
▪ Show more than the obvious, i.e. added value?

Question 3

Why are graphs good?

Answer 3

• A picture says more than 1000 words…
• A lot of information can be visualized in graphs → nice
  for project reports, Bachelor thesis,….

Question 4

What do bar charts represent?

Answer 4

Simple representation of the values for categorical variables

Question 5

Why does bar chart should start with 0

Answer 5

It can be misleading

Question 6

What rules should bar chart follow?

Answer 6

1. Start with 0
2. Have reason on predictions
3. Make sense in timing
4. Exactly same proportions

Question 7

What is combined bar chart good for?

Answer 7

• For more than one categorical variable
• Include information on the variability of the data in bar
  chart

Question 8

What are line charts used for?

Answer 8

▪ Used for time series data
Time series: data for consecutive time points
Combined line charts are widely used.

Question 9

What does histograms show?

Answer 9

• Shows the pattern of the whole dataset

Question 10

What are histograms based on?

type of charts

Answer 10

▪ Based on bar charts

Question 11

What rules should histograms follow?

Answer 11

• Columns/bars are proportional to the frequency (= how many observations are in a specific interval)
• All intervals are shown, even if they are empty
• Same width of the bins/bars