public void SystematicSelecter(int freq, int iFreq, bool randStart)
{
var selecter = new SystematicSelecter(freq, iFreq, randStart);
selecter.Invoking(x => x.Sample()).ShouldNotThrow();
foreach (var i in Enumerable.Range(0, freq * 10))
{
selecter.Invoking(x => x.Sample()).ShouldNotThrow();
}
}
public void TestSystmaticSelecter()
{
decimal tolarance = .01m;
int freqency = 15;
int iFrequency = 0;
SystematicSelecter selecter = new SystematicSelecter(freqency, iFrequency, true);
int numSamples = freqency * 10000;
int[] results = new int[numSamples];
int totalSamples = 0;
int totalISamples = 0;
for (int i = 0; i < numSamples; i++)
{
var result = selecter.Sample();
if (result == SampleResult.M)
{
results[i] = 1;
totalSamples++;
}
else if (result == SampleResult.I)
{
results[i] = 2;
totalISamples++;
}
else
{
results[i] = 0;
}
}
selecter.ITreeFrequency.ShouldBeEquivalentTo(iFrequency);
//this.TestContext.WriteLine(" numsamples = {0}", numSamples.ToString());
//this.TestContext.WriteLine("total samples = {0}", totalSamples.ToString());
//this.TestContext.WriteLine("total Isamples = {0}", totalISamples.ToString());
decimal observedFreq = (totalSamples / (decimal)numSamples);
decimal observediFreq = (totalISamples / (decimal)totalSamples);
//this.TestContext.WriteLine("Observed freq = {0}", observedFreq.ToString());
//this.TestContext.WriteLine("Observed iFreq = {0}", observediFreq.ToString());
decimal dFreq = Math.Abs((1 / (decimal)freqency) - observedFreq);
dFreq.Should().BeLessOrEqualTo(tolarance);
if (iFrequency > 0)
{
decimal dIFreq = Math.Abs((1 / (decimal)iFrequency) - observediFreq);
dIFreq.Should().BeLessOrEqualTo(tolarance);
}
}
public void TestFreqIsOne(int iFreq)
{
var freq = 1;
var selecter = new SystematicSelecter(freq, iFreq, true);
selecter.Invoking(x => x.Sample()).ShouldNotThrow();
foreach (var i in Enumerable.Range(0, freq * 10))
{
selecter.Sample().Should().Be(SampleResult.M);
}
}
public ISampleSelector MakeSystematicSampleSelector(SamplerInfo samplerInfo)
{
if (samplerInfo is null)
{
throw new ArgumentNullException(nameof(samplerInfo));
}
var state = Dataservice.GetSamplerState(samplerInfo.StratumCode, samplerInfo.SampleGroupCode);
var freq = samplerInfo.SamplingFrequency;
if (freq == 0)
{
// frequency shouldn't be 0,
// but I don't want it to break the program if it is, so for now lets just track it
Analytics.TrackEvent("ZeroFrequencySelecter Created", new Dictionary <string, string> {
{ "Method", "MakeSystematicSampleSelector" },
});
return(new ZeroFrequencySelecter(samplerInfo.StratumCode, samplerInfo.SampleGroupCode));
}
else
{
if (state != null)
{
var selecter = new SystematicSelecter(freq,
samplerInfo.InsuranceFrequency,
state.Counter,
state.InsuranceIndex,
state.InsuranceCounter,
state.SystematicIndex);
selecter.StratumCode = samplerInfo.StratumCode;
selecter.SampleGroupCode = samplerInfo.SampleGroupCode;
return(selecter);
}
else
{
var selecter = new SystematicSelecter(freq, samplerInfo.InsuranceFrequency, true);
selecter.StratumCode = samplerInfo.StratumCode;
selecter.SampleGroupCode = samplerInfo.SampleGroupCode;
return(selecter);
}
}
}
