public TestItemScoreInfo(int itemBank, long itemName, string dimension, IRTModelFactory.Model irtType, string recodeRule, int parameterCount, double weight, int scorePoint)
{
this.bank = itemBank;
this.itemName = itemName;
this.dimension = dimension;
this.measurementModel = irtType;
if (irtType != IRTModelFactory.Model.Unknown)
{
this.irtModel = IRTModelFactory.CreateModel(irtType);
this.irtModel.SetParameterCount(parameterCount, scorePoint);
}
this.recodeRuleName = recodeRule;
this.weight = weight;
this.scorePoints = scorePoint;
if (recodeRule.StartsWith("GRR("))
{
string[] recodes = recodeRuleName.Substring(4, recodeRuleName.Length - 5).Split('-');
foreach (string recode in recodes)
{
if (recode.Length != 1)
throw new ScoringEngineException("Recodes must be one digit integers: Item " + bank + "-" + itemName + ", recodeRule " + recodeRuleName);
if (!Char.IsDigit(recode[0]))
throw new ScoringEngineException("Recodes must be integers: Item " + bank + "-" + itemName + ", recodeRule " + recodeRuleName);
if (Convert.ToInt32(recode) > scorePoint)
throw new ScoringEngineException("Recodes must be less than or equal to dimension score points: Item " + bank + "-" + itemName + ", recodeRule " + recodeRuleName);
}
}
}
public void SetDimension(string dimension, IRTModelFactory.Model model, string recodeRule, double weight, int points, int parameteCount)
{
if (recodeRule.StartsWith("GRR(") && recodeRule.Substring(recodeRule.Length - 2, 1) != points.ToString())
{
throw new ScoringEngineException("recodeRule " + recodeRule + " for item " + ItemName + " does not seem to provide a recode for each of its possible scores (scorePoint = " + points + ")");
}
scoreInfo.Add(new TestItemScoreInfo(this.itemBank, this.itemID, dimension, model, recodeRule, parameteCount, weight, points));
}
public void SetFeature(string dimension, IRTModelFactory.Model model, string featureName, string featureValue)
{
TestItemScoreInfo score = FindScoreInfo(dimension, model);
if (score == null)
{
throw new Exception("Item " + this.ItemName + " does not have dimension " + dimension + " and IRT model " + model.ToString());
}
score.SetFeature(featureName, featureValue);
}
private TestItemScoreInfo FindScoreInfo(string dimension, IRTModelFactory.Model irtType)
{
foreach (TestItemScoreInfo score in this.scoreInfo)
{
if (score.Dimension == dimension && score.MeasurementModel == irtType)
{
return(score);
}
}
return(null);
}
public IRTModel(IRTModelFactory.Model model)
{
_measurementModel = model;
}
public IRTModel()
{
_measurementModel = IRTModelFactory.Model.Unknown;
}
