7.1 Ratio metrics7.1.1 When to use ratio metrics and why7.1.2 How to calculate ratio metrics7.1.3 Ratio metric case study examples7.1.4 Additional ratio metrics for the simulated social network7.2 Percentage of total metrics7.2.1 Calculating percentage of total metrics7.2.2 Percentage of total metric case study with two metrics7.2.3 Percentage of total metrics case study with multiple metrics7.3 Metrics that measure change7.3.1 Measuring change in the level of activity7.3.2 Scores for metrics with extreme outliers (fat tails)7.3.3 Measuring the time since the last activity7.4 Scaling metric time periods7.4.1 Scaling longer metrics to shorter quoting periods7.4.2 Estimating metrics for new accounts7.5 User metrics7.5.1 Measuring active users7.5.2 Active user metrics7.6 Which ratios to use7.6.1 Why use ratios, and what else is there?7.6.2 Which ratios to use?Summary