C#으로 Q-Q Plot 그리기

// 1. 데이터 읽어오기
var projectDir = Directory.GetParent(Environment.CurrentDirectory).Parent.FullName;
string filePath = Path.Combine(projectDir, "QQTest.csv");

StreamReader sr = new StreamReader(filePath, Encoding.GetEncoding("euc-kr"));
List<double> numbers = new List<double>();
while (!sr.EndOfStream)
{
    string s = sr.ReadLine();
    string[] temp = s.Split(',');        
    numbers.Add(double.Parse(temp[0]));
}

// 2. 오름차순 정렬
numbers.Sort();

// 3. 순위(Rank) 계산
var numberCount = numbers.Count;
List<double> ranks = new List<double>(); 
for (int i = 1; i < numberCount + 1; i++)
{
    ranks.Add(i);
}

// 4. 백분위 계산
List<double> percentiles = new List<double>();         
foreach (var rank in ranks)
{
    var percentile = (rank - 0.5) / numberCount;
    percentiles.Add(percentile);
}

// 5. Z-Score 계산
// 표준 정규 누적 분포 역함수 : NORM.S.INV
// MATH.NET NuGet 사용
List<double> normStandardInverses = new List<double>();
foreach (var percentile in percentiles)
{
    var normal = new Normal();
    double value = normal.InverseCumulativeDistribution(percentile);
    normStandardInverses.Add(value);
}

// 6. Q-Q Plot X, Y값 확인 
var xData = normStandardInverses;
var yData = numbers;