Data visualisation Flashcards
What graphs would you use to describe categorical data
- bar chart
- pie chart
- waffle plot
if you’re comparing categorical data on a bar chart do you need error bars
no as there is no SD it either happened or didn’t
What do 95% confidence intervals show
95% chance that the this interval includes the true population value
What does a forest plot show
summarises results from a number of scientific studies addressing the same question - it is a graphical representation of meta-analysis
What does the squares represent
study odds ratio - the size indicates relative size of the study
What does the line length represent
95% confidence intervals - if the line does not cross 1 then the treatment is significantly different from control
What does the diamond represent
the overall odds ratio
What chart and statistic would you use for categorical data for a single group
- bar chart
- pie chart
- waffle plot
Statistic - number (percent)
what graph/chart do you use for categorical odds/risk ratio
forest plot
what graph/chart do you use for categorical risk reduction
cates plot
What graphs/charts do you use to show continuous data
- histogram
- dot plot
- box and whisker
What is the pearson’s correlation coefficient
it is a statistic that measures the statistical relationship or association between 2 continuous variables
it gives information about the magnitude of the association or correlation as well as direction of the relationship
