Data visualisation Flashcards
Data for visualising + understanding
- Frequency tables
- Histograms
- Frequency graphs
- Frequency polygon
- Box plot
- Stem + leaf plot
Data for visualising, understanding + summarising
- Data table
- Bar graph
- Scatterplot
- Line graph
Why are frequency tables useful?
- Important for “first look”
- Can see the min/max response
- Can identify trends + outliers
What data do frequency tables use?
Nominal data
Why are histograms useful?
- Can see distribution + outliers
- Good for visualising
Describe presentation of columns in frequency graphs
- Columns are proportional to frequency they represent + sum to the total no. of cases
- No spaces between columns + also equal width
Outline a stem + leaf plot and give an example
The ‘stem’ is on the left and displays the first digit/digits
The ‘leaf’ is on the right and displays the last digit
E.g. 543 and 548 can be displayed together as 54 | 3,8
What do box plots summarise
dispersion of data using median, interquartile range, and top/bottom values
What type of data can’t be used for box plots?
Categorical data
What does a data table show?
Descriptive statistics of a variable
Why are data tables important?
For conducting inferential statistics and hypothesis testing as you need to first describe + summarise the groups/variables you’re comparing
What do the bars summarise in bar graphs?
Statistics for categorical data (mean, total, percentage etc.)
What is on the x and y axis of bar graphs?
Categorical variable is on X
Value of each category on Y
What are scatterplots used for?
Used to show the relationship between two quantitative variables
What is on the x and y axis on a scatterplot?
IV on x
DV on y
