### Sigma notation

Sigma notation from Mathcentre

Case study: “Measuring the competitiveness of sport: are the top teams getting too strong?” (Concentration ratio)

Case study: “Is the Scottish Premier League less competitive than its English Counterpart?” (Hirschman-Herfindahl Index)

Case study: “Measuring health improvements for a cost-effectiveness analysis”

Sigma notation from Mathtutor

### Matrices

Matrices guides, tests, and exercises from Mathcentre