[metrics-bugs] #26868 [Metrics/Statistics]: How does metrics get bridge statistics at a granularity of 1 user?

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#26868: How does metrics get bridge statistics at a granularity of 1 user?
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 Reporter:  teor                |          Owner:  metrics-team
     Type:  defect              |         Status:  closed
 Priority:  Medium              |      Milestone:
Component:  Metrics/Statistics  |        Version:
 Severity:  Normal              |     Resolution:  not a bug
 Keywords:                      |  Actual Points:
Parent ID:                      |         Points:
 Reviewer:                      |        Sponsor:
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Changes (by teor):

 * status:  new => closed
 * resolution:   => not a bug


Comment:

 Replying to [comment:8 karsten]:
 > Replying to [comment:7 teor]:
 > > ...
 > > * You say that you "Skip dates where frac is smaller than 10% and
 hence too low for a robust estimate"
 > >   * are the snowflake bridges less than 10% of total bridge usage?
 That could be why their numbers vary so much.
 > >   * how do you calculate 10% of bridge usage? (Bridges don't have
 bandwidth, so do you use unique IP addresses?)
 >
 > Wait, no, ''frac'' is the "estimated fraction of reported directory-
 request statistics". It is unrelated to snowflake in particular and refers
 to all bridge usage. The formula for computing ''frac'' is specified in
 Step 3 of the [https://metrics.torproject.org/reproducible-metrics.html
 #relay-users Relay users] section.
 >
 > Please let me know if this makes more sense now, and if not, how we can
 improve it. Thanks!

 Ok, that makes sense. Thank you for explaining!

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/26868#comment:9>
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