Workshop 4 - Graphs Flashcards

1
Q

Absolute frequency

A

The number of times you have observed that value (count)

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2
Q

Relative frequency

A

the number of times you have observed a value, expressed as a percentage.

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3
Q

Valid frequency

A

If someone leaves a question blank, you can calculate the relative frequency compared to everyone who answered that question.

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4
Q

Cumulative frequency

A

To find the cumulative relative frequency you add the relative frequencies of a group to the percentages of the previous groups.

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5
Q

Bar graph

A

Best be used if there are not too man groups + the groups all have sufficiently high frequencies. Variables on the nominal or ordinal level. The bars have to be separate.

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6
Q

Clustered bar graph

A

Two bar graphs combined into one. Nominal or ordinal level.

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7
Q

Histogram

A
  • Divide your data into fixed groups
  • You determine how many groups you want
  • The bards are stacked against each other to show that the groups are connected
    Interval / ratio level
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8
Q

Pie chart

A

Nominal or ordinal

Can see the ratios between groups less well than bar chart.

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9
Q

Line graph

A
  • You put time on the horizontal axis (X-axis)
  • You put the variable of interest on the vertical axis (Y-axis)
  • Shows the progress of a variable over time.
    Interval / ratio level
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10
Q

Box plot

A
Looks at the centre of your data and variation
Three parts:
- middle bar (mean)
- box (Q1 -> Q3)
- lines (min and max)
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