WIP: initial commit

Author: burakodabas

.gitignore

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+lib-cov
+*.seed
+*.log
+*.csv
+*.dat
+*.out
+*.pid
+*.gz
+*.swp
+
+pids
+logs
+results
+tmp
+
+
+# Coverage reports
+coverage
+
+# API keys and secrets
+.env
+
+# Dependency directory
+node_modules
+bower_components
+
+# Editors
+.idea
+*.iml
+
+# OS metadata
+.DS_Store
+Thumbs.db
+
+# Ignore built ts files
+dist/**/*

index.ts

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+// create MAD & M estimator algorithms
+function getStandardDeviation (arr: number[]) { 
+  const n = arr.length
+  const mean = arr.reduce((a, b) => a + b) / n
+  return Math.sqrt(arr.map(x => Math.pow(x - mean, 2)).reduce((a, b) => a + b) / n)
+}
+const median = (arr: number[]): number => {  
+  const s = [...arr].sort((a, b) => a - b);
+  const mid = Math.floor(s.length / 2);
+  return s.length % 2 === 0 ? ((s[mid - 1] + s[mid]) / 2) : s[mid];
+};
+function mad(arr: number[]) {
+  const med = median(arr);
+  const abs = arr.map((x) => Math.abs(x - med));  
+  return median(abs);
+}
+var arr = [1, 4, 3, 4, 5, 6, 7, 8, 9, 10]; // median is 5.5
+console.log(mad(arr)); // median absolute deviation is 2.5
+console.log( getStandardDeviation(arr) * 1.4826 );
+
+