public static IHypothesisTestingTwoSample CreateTests(HypothesisTests test)
{
IHypothesisTestingTwoSample newTest = null;
switch (test)
{
case HypothesisTests.TTest:
newTest = new StudentTTest();
break;
case HypothesisTests.MannWhitneyU:
newTest = new MannWhitneyTest();
break;
case HypothesisTests.KolmogorovSmirnov:
newTest = new KolmogorovSmirnovTest();
break;
}
return(newTest);
}
/// <summary>
/// Calculates the p-value until statistically insignificant or past a number of iterations (100);
/// </summary>
/// <param name="preDist"></param>
/// <param name="postDist"></param>
/// <param name="testType"></param>
private void TestAlignmentPValueToFailure(List<double> preDist, List<double> postDist, HypothesisTests testType,
double step)
{
double pValue = 0;
var nIterations = 0;
double shift = 0;
Print("Mean-Pre, Mean Post, Shift Amount, Mean Diff, p-Value two, left, right");
var meanPost = postDist.Average();
var postHistogram = new Histogram(.002, -.05, .05, "post-alignment");
postHistogram.AddData(postDist);
var histograms = new List<Histogram>();
histograms.Add(postHistogram);
while (pValue < .05 && nIterations < 100)
{
var newPre = new List<double>();
preDist.ForEach(x => newPre.Add(x + shift));
var mean = newPre.Average();
var test = HypothesisTestingFactory.CreateTests(testType);
var data = test.Test(newPre, postDist);
Print(string.Format("{0},{1},{2},{3},{4},{5},{5}", mean, meanPost, shift, Math.Abs(mean - meanPost),
data.TwoTail, data.LeftTail, data.RightTail));
var preHistogram = new Histogram(.002, -.05, .05, string.Format("{0:.0000}", mean));
preHistogram.AddData(newPre);
histograms.Add(preHistogram);
pValue = data.TwoTail;
nIterations++;
shift += step;
}
var originalPreHistogram = new Histogram(.002, -.05, .05, "pre-histogram");
originalPreHistogram.AddData(preDist);
Print("");
PrintHistogram(originalPreHistogram);
Print("");
PrintHistogram(postHistogram);
Print("");
PrintHistogram("pre-post", histograms);
Print("");
}
public void TestAlignmentPValueToFailure(string basePath, string name, double step, HypothesisTests testType)
{
RootDataPath = basePath;
var preDist = new List<double>();
var postDist = new List<double>();
var lines = File.ReadAllLines(Path.Combine(basePath, name));
var header = true;
Print(string.Format("TEST: {1} - {0}", name, testType));
Print("");
foreach (var line in lines)
{
if (!header)
{
var stringData = line.Split(',');
if (stringData.Length > 2)
{
var preValue = Convert.ToDouble(stringData[1]);
var postValue = Convert.ToDouble(stringData[2]);
//if (Math.Abs(preValue) < .05)
{
preDist.Add(preValue);
}
//if (Math.Abs(postValue ) < .05)
{
postDist.Add(postValue);
}
}
}
header = false;
}
TestAlignmentPValueToFailure(preDist, postDist, testType, step);
}
/// <summary>
/// Calculates the p-value until statistically insignificant or past a number of iterations (100);
/// </summary>
/// <param name="preDist"></param>
/// <param name="postDist"></param>
/// <param name="testType"></param>
private void TestAlignmentPValueToFailure(List <double> preDist, List <double> postDist, HypothesisTests testType,
double step)
{
double pValue = 0;
var nIterations = 0;
double shift = 0;
Print("Mean-Pre, Mean Post, Shift Amount, Mean Diff, p-Value two, left, right");
var meanPost = postDist.Average();
var postHistogram = new Histogram(.002, -.05, .05, "post-alignment");
postHistogram.AddData(postDist);
var histograms = new List <Histogram>();
histograms.Add(postHistogram);
while (pValue < .05 && nIterations < 100)
{
var newPre = new List <double>();
preDist.ForEach(x => newPre.Add(x + shift));
var mean = newPre.Average();
var test = HypothesisTestingFactory.CreateTests(testType);
var data = test.Test(newPre, postDist);
Print(string.Format("{0},{1},{2},{3},{4},{5},{5}", mean, meanPost, shift, Math.Abs(mean - meanPost),
data.TwoTail, data.LeftTail, data.RightTail));
var preHistogram = new Histogram(.002, -.05, .05, string.Format("{0:.0000}", mean));
preHistogram.AddData(newPre);
histograms.Add(preHistogram);
pValue = data.TwoTail;
nIterations++;
shift += step;
}
var originalPreHistogram = new Histogram(.002, -.05, .05, "pre-histogram");
originalPreHistogram.AddData(preDist);
Print("");
PrintHistogram(originalPreHistogram);
Print("");
PrintHistogram(postHistogram);
Print("");
PrintHistogram("pre-post", histograms);
Print("");
}
public void TestAlignmentPValueToFailure(string basePath, string name, double step, HypothesisTests testType)
{
RootDataPath = basePath;
var preDist = new List <double>();
var postDist = new List <double>();
var lines = File.ReadAllLines(Path.Combine(basePath, name));
var header = true;
Print(string.Format("TEST: {1} - {0}", name, testType));
Print("");
foreach (var line in lines)
{
if (!header)
{
var stringData = line.Split(',');
if (stringData.Length > 2)
{
var preValue = Convert.ToDouble(stringData[1]);
var postValue = Convert.ToDouble(stringData[2]);
//if (Math.Abs(preValue) < .05)
{
preDist.Add(preValue);
}
//if (Math.Abs(postValue ) < .05)
{
postDist.Add(postValue);
}
}
}
header = false;
}
TestAlignmentPValueToFailure(preDist, postDist, testType, step);
}
