Difference between revisions of "Analytica User FAQs"

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-= [[/Training and Consulting Help]] =
+[[Category: FAQ]]
-= [[/Reference Materials and Additional Reading]] =
+* [[/Training and Consulting Help]]
-= [[/Sharing Models]] =
+* [[/Reference Materials and Additional Reading]]
-= [[/Application Integration]] =
+* [[/Sharing Models]]
-= [[/ADE]] =
+* [[/Application Integration]]
-= [[/Installer Issues]] =
+* [[/ADE]]
-= [[Application Issues]] =
+* [[/Application Issues]]
-= Analytica Expression FAQs =
+* [[/User interface questions]]
-(In progress -- two things need to occur.  Common questions need to be collected here and organized, and then answers need to be added.  Feel free to contribute to either aspect)
+* [[/Expressions - How to]]
-== Array Abstraction ==
+* [[/Modeling issues]]
-* How do I access a single row of an array?
+* [[/Types of Inference]]
-* How do I represent a square matrix?
-* How do I re-index an array, exchanging one index, I, for another of the same length, J?
-* How do I aggregate an array from a fine grain index (e.g., days) to a coarser index (e.g., months)?
-== Distributions ==
+* [[/Editions, licenses, and installation]]
-* How do I generate independent distributions across an index, for example, so that Noise := Normal(0,1) is independent for each time point t?
+* [[/Editions]]
-* How do I define a chance variable so that its uncertainty is correlated with an existing chance variable?
+* [[/Licenses]]
-* [[How to Fit a Distribution to Data|How do a fit a distribution to historical data?]]
+* [[/Section 508 Compliance (VPAT)]]
-== User-Defined Functions ==
+* [[/Installer Issues]]
-* How do I create my own User-Defined function?
+* [[/Troubleshooting]]
-* How do I create a custom distribution function?
-== How do I model X (Depreciation)? ==
-* Depreciation (offset in time)?
-To model depreciation, two inputs are required:
-) a schedule of spend to be depreciated
-) a depreciation schedule
-For this example, the index time is 10 year series with a constant startYear=2008
-time:=sequence (startYear,startYear+9,1)
-Example depreciation schedule is a 5yr MACRS depreciation schedule entered as a variable:
-Table(time)(.2,.32,.192,.1152,.1152,.0576,0,0,0,0)
-SpendOverTime is a variable indexed by time with the capital spend amounts as desired:
-table(time)(0,0,111,0,0,0,0,0,0,0)
-Create a user defined function:
-Function_Depreciation,
-'''Parameters''': (SpendOverTime,DepreciationSchedule),
-'''Definition''':
-index depr_years = copyindex(time);
-var deprStartyr:=time;
-sum(if time-depr_years+1<1 then 0 else
-slice(SpendOverTime,time,Depr_years-startYear+1)*slice(depreciationSchedule,time,time-depr_years+1),depr_years)
-Then create a depreciation test variable to check the result
-Variable: DepreciationTest  definition: function_Depreciation(spendOverTime,DepreciationSchedule)
-== What does Analytica use to represent missing values? ==
-Analytica has no special MissingValue constant.
-I would recommend using Null. However, because Analytica does not interpret this (or any other constant) as meaning a missing value, you will need to insert appropriate conditional logic to deal with the missing values in the appropriate fashion. For example:
-Sum( MaybeMissing(x), I )
-Product( MaybeMissing(x,1), I )
-where
-Function MaybeMissing( x ; defX : optional )
-Definition: if x=Null then if IsNotSpecified(defX) then 0 else defX else X