### Workshop Outline

#### Unit 3 Workshop 1

6-hour workshop covering the first half of Unit 3

##### Associations between categorical variables

- bivariate data, two-way frequency tables and association
- scatterplots and strength of association
- linear model by method of least squares
- residual plots and coefficient of determination (R
^{2}) - make predictions by interpolation and extrapolation
- association and causation, coincidence and confounding

##### Time series

- features of time series plots such as long-term trend, seasonality, short term irregular fluctuations and outliers
- smoothing data and seasonal indices
- modelling long term trends with least-squares line