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diff --git a/runtime/CSharp2/Sources/Antlr3.Runtime/Antlr.Runtime.Misc/Stats.cs b/runtime/CSharp2/Sources/Antlr3.Runtime/Antlr.Runtime.Misc/Stats.cs
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+++ b/runtime/CSharp2/Sources/Antlr3.Runtime/Antlr.Runtime.Misc/Stats.cs
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+/*
+ * [The "BSD licence"]
+ * Copyright (c) 2005-2008 Terence Parr
+ * All rights reserved.
+ *
+ * Conversion to C#:
+ * Copyright (c) 2008-2009 Sam Harwell, Pixel Mine, Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+namespace Antlr.Runtime.Misc {
+    using System.Collections.Generic;
+    using Antlr.Runtime.JavaExtensions;
+
+    using Math = System.Math;
+
+    /** <summary>Stats routines needed by profiler etc...</summary>
+     *
+     *  <remarks>
+     *  note that these routines return 0.0 if no values exist in the X[]
+     *  which is not "correct", but it is useful so I don't generate NaN
+     *  in my output
+     *  </remarks>
+     */
+    public class Stats {
+        public const string ANTLRWORKS_DIR = "antlrworks";
+
+        /** <summary>Compute the sample (unbiased estimator) standard deviation following:</summary>
+         *
+         *  <remarks>
+         *  Computing Deviations: Standard Accuracy
+         *  Tony F. Chan and John Gregg Lewis
+         *  Stanford University
+         *  Communications of ACM September 1979 of Volume 22 the ACM Number 9
+         *
+         *  The "two-pass" method from the paper; supposed to have better
+         *  numerical properties than the textbook summation/sqrt.  To me
+         *  this looks like the textbook method, but I ain't no numerical
+         *  methods guy.
+         *  </remarks>
+         */
+        public static double Stddev(int[] X) {
+            int m = X.Length;
+            if (m <= 1) {
+                return 0;
+            }
+            double xbar = EnumerableExtensions.Average(X);
+            double s2 = 0.0;
+            for (int i = 0; i < m; i++) {
+                s2 += (X[i] - xbar) * (X[i] - xbar);
+            }
+            s2 = s2 / (m - 1);
+            return Math.Sqrt(s2);
+        }
+        public static double Stddev(List<int> X) {
+            int m = X.Count;
+            if (m <= 1) {
+                return 0;
+            }
+            double xbar = EnumerableExtensions.Average(X);
+            double s2 = 0.0;
+            for (int i = 0; i < m; i++) {
+                s2 += (X[i] - xbar) * (X[i] - xbar);
+            }
+            s2 = s2 / (m - 1);
+            return Math.Sqrt(s2);
+        }
+
+#if DEBUG
+        /** <summary>Compute the sample mean</summary> */
+        [System.Obsolete]
+        public static double avg(int[] X) {
+            return EnumerableExtensions.Average(EnumerableExtensions.DefaultIfEmpty(X, 0));
+        }
+
+        [System.Obsolete]
+        public static int min(int[] X) {
+            return EnumerableExtensions.Min(EnumerableExtensions.DefaultIfEmpty(X, int.MaxValue));
+        }
+
+        [System.Obsolete]
+        public static int max(int[] X) {
+            return EnumerableExtensions.Max(EnumerableExtensions.DefaultIfEmpty(X, int.MinValue));
+        }
+
+        [System.Obsolete]
+        public static int sum(int[] X) {
+            return EnumerableExtensions.Sum(X);
+        }
+#endif
+
+        public static void WriteReport(string filename, string data) {
+            string absoluteFilename = GetAbsoluteFileName(filename);
+
+            System.IO.Directory.CreateDirectory(System.IO.Path.GetDirectoryName(absoluteFilename));
+            System.IO.File.AppendAllText(absoluteFilename, data);
+        }
+
+        public static string GetAbsoluteFileName(string filename) {
+            string personalFolder = System.Environment.GetFolderPath(System.Environment.SpecialFolder.Personal);
+            return personalFolder + System.IO.Path.DirectorySeparatorChar +
+                        ANTLRWORKS_DIR + System.IO.Path.DirectorySeparatorChar +
+                        filename;
+        }
+    }
+}