Nayland College - Mathematics
3.9 Bivariate HOME | Achievement Objectives | Overview | Data sets & Variable Types | Introduction | Scatter plots | Excel | iNZight | Correlation Coefficient & Linear Model | The effect of Groups & Unusual Values | Predictions | Causality | Non-Linear Models | Discussion & Conclusion | Report Writing
Investigating underlying groups (effect of groups)
Limitations due to the initial data set (and how the data was collected) or how you did your analysis
Unusual values. Identify & comment, More information is needed regarding an unusual value. Is it an error or different for a reason?
Other Models. Is the linear model appropriate? Other models better and suit the context better?
Any potential sources of bias, in the analysis or the original data?
Discuss any assumptions made during your investigation.
Relevance & usefulness
plots residuals, regression lines etc http://stat-www.berkeley.edu