Ticket #1110 (closed assessed: fixed)

Opened 12 years ago

Last modified 12 years ago

Monte Carlo seems to perturb values outside allowed limits

Reported by: lingbol Owned by: jeroens
Priority: normal Milestone: Ecopath 6: release 6.3 BETA
Component: Monte Carlo Version:
Severity: tweak Keywords:


Sometimes I got values outside the range I set. For example, I set CV of EE of one group as 0.2 (range from 0.1-0.21) with its original value of EE is 0.15. However, from the output of MC runs, I notice I got EE from 0.04 to 0.98 with a mean of 0.16 and standard deviation of 0.18. I don't know how MC works on EE. I set 0.2 CV for P/B and Q/B for this group. As EE is estimated based on P/B, fishing and predation mortality (I have no BA or emigration). Once a new P/B is set, EE must be changed correspondingly, right? If EE is outside of the range (e.g. in my case, 0.1-0.21), the new P/B should be rejected and try another value again. That is the way it should work, I think.

Change History

comment:1 Changed 12 years ago by jeroens

  • Severity changed from minor to tweak

Any parameter that is estimated by Ecopath is not perturbed by MC. As a solution estimated values should be blocked out in the MC interface

comment:2 Changed 12 years ago by jeroens

  • Owner changed from joeb to jeroens
  • Status changed from new to assigned

Confirmed with Carl: block out cells that will be estimated by MC

comment:3 Changed 12 years ago by jeroens

  • Status changed from assigned to closed
  • Resolution set to fixed


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