ISmSimultaneousSystem.UseConstantAsInstrument

Syntax

UseConstantAsInstrument: Boolean;

Description

The UseConstantAsInstrument property determines whether to use the constant as an instrumental variable.

Comments

Available values:

True. The constant is used as an instrumental variable.
False. The constant is used as usually.

Example

To execute the example, add a link to the Stat system assembly.

Sub UserProc;
Var
    simeq: SmSimultaneousSystem;
    eqs: ISlSimultaneousEquations;
    eq: ISlSimultaneousEquation;
    can, fra, ger, ita, jpn, us, uk: Array[20] Of Double;
    res, i: Integer;
Begin
    simeq := New SmSimultaneousSystem.Create;

    // Set values can,fra,ger,ita,jpn,us,uk
    can[00] := 6209; fra[00] := 4110; ger[00] := 3415; ita[00] := 2822; jpn[00] := 1475; uk[00] := 5320; us[00] := 8680;
    can[01] := Double.Nan; fra[01] := 4280; ger[01] := 3673; ita[01] := 3023; jpn[01] := 1649; uk[01] := 5484; us[01] := 9132;
    can[02] := 6752; fra[02] := 4459; ger[02] := 4013; ita[02] := 3131; jpn[02] := 1787; uk[02] := 5517; us[02] := 9213;
    can[03] := 6837; fra[03] := 4545; ger[03] := 4278; ita[03] := 3351; jpn[03] := 1884; uk[03] := 5791; us[03] := 9450;
    can[04] := 6495; fra[04] := Double.Nan; ger[04] := 4577; ita[04] := 3463; jpn[04] := 1972; uk[04] := 5971; us[04] := 9177;
    can[05] := 6907; fra[05] := 4861; ger[05] := 5135; ita[05] := 3686; jpn[05] := 2108; uk[05] := 6158; us[05] := 9756;
    can[06] := 7349; fra[06] := 5195; ger[06] := 5388; ita[06] := 3815; jpn[06] := 2249; uk[06] := 6238; us[06] := 9756;
    can[07] := 7213; fra[07] := 5389; ger[07] := 5610; ita[07] := 3960; jpn[07] := 2394; uk[07] := 6322; us[07] := 9724;
    can[08] := 7061; fra[08] := 5463; ger[08] := 5787; ita[08] := 4119; jpn[08] := 2505; uk[08] := 6340; us[08] := 9476;
    can[09] := Double.Nan; fra[09] := 5610; ger[09] := 6181; ita[09] := 4351; jpn[09] := 2714; uk[09] := 6569; us[09] := 9913;
    can[10] := 7132; fra[10] := 5948; ger[10] := 6633; ita[10] := 4641; jpn[10] := 3052; uk[10] := 6813; us[10] := 9974;
    can[11] := 7137; fra[11] := 6218; ger[11] := 6910; ita[11] := 5008; jpn[11] := 3453; uk[11] := 6974; us[11] := 10046;
    can[12] := 7473; fra[12] := 6521; ger[12] := 7146; ita[12] := 5305; jpn[12] := 3666; uk[12] := 6994; us[12] := 10467;
    can[13] := 7722; fra[13] := 6788; ger[13] := 7248; ita[13] := 5611; jpn[13] := 4008; uk[13] := 7220; us[13] := 10740;
    can[14] := 8088; fra[14] := Double.Nan; ger[14] := 7689; ita[14] := 5693; jpn[14] := 4486; uk[14] := 7570; us[14] := 11157;
    can[15] := 8516; fra[15] := 7486; ger[15] := 8046; ita[15] := 5804; jpn[15] := 4663; uk[15] := 7686; us[15] := 11738;
    can[16] := 8941; fra[16] := 7832; ger[16] := 8143; ita[16] := 6121; jpn[16] := 5115; uk[16] := 7811; us[16] := 12274;
    can[17] := 9064; fra[17] := 8153; ger[17] := 8064; ita[17] := 6546; jpn[17] := 5655; uk[17] := 8012; us[17] := 12450;
    can[18] := 9380; fra[18] := 8468; ger[18] := 8556; ita[18] := 6918; jpn[18] := 6358; uk[18] := 8265; us[18] := 12874;

    // Set calculation period
    simeq.ModelPeriod.FirstPoint := 1;
    simeq.ModelPeriod.LastPoint := 20;
    // Set missing data treatment parameters
    simeq.MissingData.Method := MissingDataMethod.LinTrend;
    // Estimation method for systems of simultaneous equations
    simeq.SimultaneousSystemMethod := SimultaneousSystemMode.General;
    // Use constant as an instrumental variable
    simeq.UseConstantAsInstrument := True;
    eqs := simeq.Equations;
    // Set the first equation
    eq := eqs.Add;
    eq.DependentVariable.Value := can;
    eq.EndogenousVariables.Add.Value := fra;
    eq.EndogenousVariables.Add.Value := ger;
    eq.ExogenousVariables.Add.Value := us;
    eq.ExogenousVariables.Add.Value := uk;
    eq.ExogenousVariables.Item(0).Include := False;
    eq.Intercept.Mode := InterceptMode.AutoEstimate;
    // Set the second equation
    eq := eqs.Add;
    eq.DependentVariable.Value := fra;
    eq.EndogenousVariables.Add.Value := ger;
    eq.EndogenousVariables.Add.Value := ita;
    eq.EndogenousVariables.Item(1).Include := False;
    eq.ExogenousVariables.Add.Value := jpn;
    eq.ExogenousVariables.Add.Value := us;
    // Set stack instrumental variables
    simeq.StackInstrumental.Add.Value := us;
    // Set maximum number of iterations
    simeq.MaxIteration := 250;
    // Set accuracy of solution
    simeq.Tolerance := 0.001;

    // Execute calculation and display results
    res := simeq.Execute;
    Debug.WriteLine(simeq.Errors);
    Debug.WriteLine("The first equation. Modeling series");
    Debug.Indent;
    For i := 0 To simeq.ModelPeriod.LastPoint - 1 Do
        Debug.Write(i.ToString + " ");
        Debug.WriteLine(eqs.Item(0).Fitted[i]);
    End For;
    Debug.Unindent;
    Debug.WriteLine("The second equation. Modeling series");
    Debug.Indent;
    For i := 0 To simeq.ModelPeriod.LastPoint - 1 Do
        Debug.Write(i.ToString + " ");
        Debug.WriteLine(eqs.Item(1).Fitted[i]);
    End For;
    Debug.Unindent;
End Sub UserProc;

After executing the example the console window displays modeling series for both equations.