This measures the average size of types in a package in a more reliable way than just looking at the number of lines of code.

Pre-packaged Query

Name of query = "Semmle/Metrics/Packages/Averages/Average number of methods

For each package, this query reports the average number of methods, taking over all types in that package. The result is displayed as a bar chart.

from MetricPackage p
where p.fromSource()
select p, avg(MetricRefType t | t = p.getARefType() | t.getNumberOfMethods())

.QL Source of Metric

See Number of Callables of a Type.