Data Visualisation Flashcards
What are the ways to visualise and illustrate data?
stem and leaf plots
box plots
distributions e.g histograms
bar chart
scatter plots
tables and figures
What are stem and leaf plots useful for showing?
the median, range, IQR, skewness statistic
How are stem and leaf plots displayed?
2 columns
stem represents larger units
leaf represents smaller units
What do box plots show?
median, any outliers represented by a small circle, max and min, IQR, range
How are Tables displayed?
title is in italics
numbered e.g Table 1 in Bold
have simple gridlines
figures are similar
How are Bar Charts displayed?
can either be simple or clustered bar chart (2 bars connected together)
has no border, title
axis are labelled
error bars can be presented
What are error bars?
used to display either S.D, min and max or confidence intervals
What does a short error bar mean?
means the average value is more certain
What are 2 types of distributions?
frequency distributions
probability distributions
What are frequency distributions?
an example would be histograms
they have individual frequency bars
What are probability distributions?
bell curves
area under curve is probability value occurs
segmented by S.Ds
What are the 2 ways in which distributions can deviate from normal?
having a lack of symmetry (being skewed)
Kurtosis
What does skewness statistic have to be between to be considered not skewed?
-1 and 1
What does kurtosis mean?
pointiness
