IMs2SLSTransform.Coefficients

Syntax

Coefficients(Coord: IMsFormulaTransformCoord): Array;

Parameters

Coord. The output variable dimension for which the calculation is performed.

Description

The Coefficients property determines an array of values of model equation coefficients. If a constant is present in the equation, its value is specified in the last element of the array. To save the coefficients, an array of values must be assigned for this property, to flush the coefficients, the Null value must be assigned.

Example

Executing the example requires that the repository contains a modeling container with the MODEL_SPACE identifier. A model with the New_2SLS identifier created in this container uses the method of linear regression for calculation (instrumental variables estimation).

Add links to the Metabase, Ms system assemblies.

Sub UserProc;
Var
    MB: IMetabase;
    MObj: IMetabaseObject;
    Model: IMsModel;
    Trans: IMsFormulaTransform;
    VarTrans: IMsFormulaTransformVariable;
    Tree: IMsFormulaTransformSlicesTree;
    Slice: IMsFormulaTransformSlice;
    Selector: IMsFormulaTransformSelector;
    Formula: IMsFormula;
    SLS: IMs2SLSTransform;
    Calc: IMsModelCalculation;
    Coord: IMsFormulaTransformCoord;
    Coef: Array Of Double;
    i: Integer;
Begin
    MB := MetabaseClass.Active;
    MObj := MB.ItemByIdNamespace("New_2SLS", MB.ItemById("MODEL_SPACE").Key).Edit;
    Model := MObj As IMsModel;
    Trans := Model.Transform;
    VarTrans := Trans.Outputs.Item(0);
    Tree := VarTrans.SlicesTree(VarTrans);
    Slice := Tree.CreateSlice(1);
    Selector := Trans.CreateSelector;
    Selector.Slice := Slice;
    Formula := Trans.Transform(Selector);
    SLS := Formula.Method As IMs2SLSTransform;
    Calc := Model.CreateCalculation;
    Calc.Period.IdentificationStartDate := DateTime.ComposeDay(1990, 01, 01);
    Calc.Period.IdentificationEndDate := DateTime.ComposeDay(2000, 12, 31);
    Calc.Period.ForecastStartDate := DateTime.ComposeDay(2001, 01, 01);
    Calc.Period.ForecastEndDate := DateTime.ComposeDay(2010, 01, 01);
    Coord := Trans.CreateCoord(VarTrans);
    //Identification of new equation
    SLS.Identify(Calc As IMsMethodCalculation, Coord);
    //Receive the calculated coefficients
    Coef := SLS.Coefficients(Coord);
    //If is not saved - save
    If Not SLS.IsCoefficientsSaved(Coord) Then
        SLS.Coefficients(Coord) := Coef;
    End If;
    //Display to console
    For i := 0 To Coef.Length - 1 Do
        Debug.WriteLine(Coef[i]);
    End For;
    MObj.Save;
End Sub UserProc;

After executing the example, new coefficients of equation are calculated. The coefficient values are saved and displayed in the development environment console window.