- a period is set to "last 30 days"
- a module was created inside a project 10 days ago
- this module doesn't have a variation value for the period
Note that setting 0 on the variation would be wrong. For instance, even if module M was introduced one week ago (with an initial 1000 LoC) and 100 LoC have been added since then, the variation for "ncloc" over 30 days should be 1100 (=> 1100 LoC have actually been added on this module over the past 30 days).