Changes between Version 2 and Version 3 of EwEugBalancingaModel

Timestamp:

2010-11-23 01:18:06 (14 years ago)

Author:

shermanl

Comment:

--

EwEugBalancingaModel

@@ -9 +9 @@
 Problems in parameter estimation will be shown in the ''Status panel''. Two types of message may be displayed in the ''Status panel'' while you are balancing your model:
 
-  Information messages [[[Image(wiki:EwEugImages:03000051.png)]]]. Information messages provide feedback on regular events in EwE. Information events are confirmations of things that went well.  Examples are opening the model; successful edits; and successful balancing (i.e., parameterization) of the model. Warning messages [[[Image(wiki:EwEugImages:03000052.png)]]]. Warnings occur when EwE was not able to complete an action and requires the user to fix a problem, usually with the input data. For example, one of the most important of these is when parameterization fails (i..e., the model failed to balance). When this occurs, you will get the message “Your model is NOT balanced! Computed Ecotrophic Efficiencies (''EE'') invalid for one or more group(s).”  Clicking on the “+” icon next to this message expands the message to show which groups are causing the problem.
+  Information messages [[[Image(wiki:EwEugImages:03000051.png)]]]. Information messages provide feedback on regular events in EwE. Information events are confirmations of things that went well.  Examples are opening the model; successful edits; and successful balancing (i.e., parameterization) of the model. Warning messages [[[Image(wiki:EwEugImages:03000052.png)]]]. Warnings occur when EwE was not able to complete an action and requires the user to fix a problem, usually with the input data. For example, one of the most important of these is when parameterization fails (i..e., the model failed to balance). When this occurs, you will get the message "Your model is NOT balanced! Computed Ecotrophic Efficiencies (''EE'') invalid for one or more group(s)."  Clicking on the "+" icon next to this message expands the message to show which groups are causing the problem.
 
 An exhaustive set of guidelines for how a model should be balanced cannot be given. However, if it existed, such a set would include the following general guidelines:
@@ -23 +23 @@
   * Search out one group with a bigger problem and try to solve this. Are the ''P/B, Q/B'' and ''B'' values appropriate for this group? What would happen to, e.g., the ''GE'' and the ''EE'' if you changed the parameters? If the problem is the consumption by predators, look at the [wiki:EwEugPredationMortality Predation mortality] form, and identify the quantitatively most important predators. Check the diet compositions and ''B'' and ''Q/B'' values for these predators;
 
-  * Continue for as long as necessary, documenting carefully what changes are made. It may be a good idea to save the data file under a new name each time changes are made (e.g. starting with ‘Model_1’, on to ‘Model_2’ etc.);
+  * Continue for as long as necessary, documenting carefully what changes are made. It may be a good idea to save the data file under a new name each time changes are made (e.g. starting with 'Model_1', on to 'Model_2' etc.);
 
-  * You may get warnings that the ‘Respiration cannot be negative’. If this happens the second master equation of Ecopath has been violated. We have:
+  * You may get warnings that the 'Respiration cannot be negative'. If this happens the second master equation of Ecopath has been violated. We have:
 
 Consumption = production + respiration + unassimilated food,
@@ -41 +41 @@
   * Examine the [wiki:EwEugElectivity Electivity] form. Do the preferences seem reasonable?
 
-  * Examine the [wiki:EwEugPredationMortality Predation mortalities] under the''Mortalities'' node in the ''Navigator window''. The predation mortality spreadsheet will show you how important the various predators are for any group. Does this show what you expect? Are the predators shown to be the most important predators in accordance with what you expect? If not, re-evaluate your model’s diet compositions. __The information on the mortality forms is very important__!
+  * Examine the [wiki:EwEugPredationMortality Predation mortalities] under the''Mortalities'' node in the ''Navigator window''. The predation mortality spreadsheet will show you how important the various predators are for any group. Does this show what you expect? Are the predators shown to be the most important predators in accordance with what you expect? If not, re-evaluate your model's diet compositions. __The information on the mortality forms is very important__!
 
   * Noting how the energy balance of a group is formulated, it is clear that, for instance, increasing the proportion of the consumption that is not assimilated will leave less energy to respiration (production being unaffected). This will result in a lower R/B ratio and a larger flow to the detritus. The latter may be necessary to balance the model if there is only little system surplus production.