Setting Up Parameters of the Extrapolate Method

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                   "n" : "MyOutputVavable",
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                   "excluded" : "0",
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                                      ]
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                                     "method" : "Casewise",
                                     "methodParameter" : "5",
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                                      }
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                                       "k" : "0",
                                       "id" : "MyOutputVavable|A",
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                                     "termToInnerText" : "@_1:0[]",
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                                       "inversion" : 
                                        {
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                                         "lag" : "PrecidingValue",
                                         "previousLag" : "-1",
                                         "seasonality" : "None",
                                         "dependence" : "Linear",
                                         "K" : "3"
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                                         "id" : "MyOutputVavable|A",
                                         "n" : "MyOutputVavable|A",
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                                           "measure" : "4294967295",
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                                  },
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                              }
                            ]
                          }
                        },
                       "kind" : "Simple"
                      },
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                    }
                  }
                ]
              }
            },
           "visualController" : 
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             "variableRubricatorKey" : "89671",
             "freeVariables" : 
              {
               "its" : ""
              },
             "userRPath" : "",
             "isRExist" : "0"
            },
           "suppressEmptyFilter" : 
            {
             "suppressEmpty" : "0",
             "suppressEmptyArea" : "SerieBounds"
            },
           "readOnly" : "0",
           "variableTestUseR" : "0",
           "calculateIdentOnFact" : "0"
          },
         "scenarios" : 
          {
           "its" : ""
          },
         "details" : 
          {
           "period" : 
            {
             "identificationStartDate" : "1990-01-01",
             "identificationEndDate" : "2018-04-24",
             "forecastStartDate" : "2018-04-25",
             "forecastEndDate" : "2020-01-01",
             "identificationStartDateParamID" : "",
             "identificationEndDateParamID" : "",
             "forecastStartDateParamID" : "",
             "forecastEndDateParamID" : "",
             "autoPeriod" : "0",
             "identificationStartOffset" : "0",
             "identificationEndOffset" : "0",
             "forecastEndOffset" : "0",
             "isIdentStartCorrect" : "1",
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      }
    }
  }
}

public static MsItem SetMsCurveEstimation(MsId ms, ulong modelKey, ulong eqKey)
{
    var setMsOp = new SetMs();
    // Set operation execution parameters
    setMsOp.tMs = ms;
    setMsOp.tArg = new SetMsArg()
    {  // Set data change pattern
        pattern = new MsMdPattern()
        {
            item = new MsItemPattern()
            {  // Specify model key
                key = modelKey,
                problem = new MsProblemPattern()
                {
                    metamodel = new MsMetaModelPattern()
                    {
                        calculationChain = ListOperation.Change
                    }
                } 
            }
        },
        // Set data that must be changed
        meta = new MsMd()
        {
            item = new MsItem()
            {  // Specify model key
                k = modelKey,
                type = MsItemType.Problem,
                problemMd = new MsProblem()
                {
                    metamodel = new MsMetaModel()
                    {
                        calculationChain = new MsCalculationChainEntries()
                        {
                            its = new MsCalculationChainEntry []
                            {
                                new MsCalculationChainEntry()
                                { 
                                    k = eqKey,
                                    type = MsCalculationChainType.Model,
                                    model = new MsModel()
                                    {
                                        transform = new MsFormulaTransform()
                                        {
                                            formulas = new TsFormulas()
                                            {
                                                its = new TsFormula[]
                                                {
                                                    new TsFormula()
                                                    {
                                                        k = 0,
                                                        kind = TsFormulaKind.CurveEstimation,
                                                        method = new TsMethod()
                                                        {   // Set parameters of the Extrapolate method                                     
                                                            curveEstimation = new TsCurveEstimationMethod()
                                                            {  // Set confidence limits relevance
                                                                confidenceLevel = 0.96,                                                         
                                                                // Set estimation criterion
                                                                criterion = StatDependenceCriterionType.R2,
                                                                // Set analyzed dependency forms
                                                                dependenceForm = null,
                                                                dependenceFormIncluded = new StatDependenceType[]
                                                                {
                                                                    StatDependenceType.Linear,
                                                                    StatDependenceType.Polynomial,
                                                                    StatDependenceType.Logarithmic
                                                                },
                                                                // Set polynomial degree
                                                                polynomOrder = 4,
                                                                // Set seasonal effect
                                                                seasonalComponent = new StatSeasonal()
                                                                {
                                                                    mode = StatSeasonalityType.Additive,
                                                                    cycle = 4
                                                                },
                                                                missingData = new StatMissingData(){},  
                                                                // Do not use extrapolation
                                                                extrapolateType = null,
                                                                value = 0
                                                            }
                                                        }
                                                    }
                                                }
                                            }
                                        }
                                    }
                                }
                            }
                        }
                    }
                }                    
            }
        }
        , // Set changed data getting pattern
        metaGet = new MsMdPattern()
        {
            scenarios = ListOperation.Get,
            period = true,
            item = new MsItemPattern()
            {
                key = modelKey,
                problem = new MsProblemPattern()
                {
                    details = true,
                    scenarios = ListOperation.Get,
                    useSavedCoefficients = true,
                    metamodel = new MsMetaModelPattern()
                    {
                        calculationChain = ListOperation.Get,
                        calcChainPattern = new MsCalculationChainPattern()
                        {
                            modelPattern = new MsModelPattern()
                            {
                                transform = new MsFormulaTransformPattern()
                                {
                                    kind = true,
                                    formulaCount = true,
                                    formulas = new TsFormulaPattern()
                                    {
                                        method = new TsMethodPattern() { }
                                    },
                                    equationsFormula = new TsFormulaPattern()
                                    {
                                        method = new TsMethodPattern() { }
                                    }
                                }
                            }
                        },
                        visualControllerPattern = new MsMetaModelVisualControllerPattern()
                        {
                            variableRubricatorKey = true,
                            levelFormat = MsLevelFormat.Short,
                            useSourceName = false,
                            freeVariables = true
                        }
                    }
                }
            }
        }
    };
    // Create a proxy object for operation execution
    var somClient = new SomPortTypeClient();
    // Set operation execution parameters
    var result = somClient.SetMs(setMsOp);
    return result.meta.item;
}