feat : add accuracy calculation

src/lib/helpers.ts

@@ -5,3 +5,37 @@ export const getPaddedMonth = (month: number) => {
 export const capitalize = (s: string) => {
   return s.charAt(0).toUpperCase() + s.slice(1);
 };
+
+export const ceilsNumber = (number: number, min: number, max: number) => {
+  if (number > max) return max;
+  if (number < min) return min;
+  return number;
+};
+
+export const getHarmonicMean = (array: number[]) => {
+  const sum = array.reduce((acc, curr) => acc + 1 / curr, 0);
+  return array.length / sum;
+};
+
+export const getStandardDeviation = (array: number[]) => {
+  const n = array.length;
+  const mean = array.reduce((a, b) => a + b) / n;
+  return Math.sqrt(
+    array.map((x) => Math.pow(x - mean, 2)).reduce((a, b) => a + b) / n
+  );
+};
+
+export const getWeightedMean = (array: number[], weights: number[]) => {
+  if (array.length > weights.length)
+    throw new Error("Weights array is too short");
+
+  const weightedSum = array.reduce(
+    (acc, curr, index) => acc + curr * weights[index],
+    0
+  );
+  const weightSum = weights
+    .slice(0, array.length)
+    .reduce((acc, curr) => acc + curr, 0);
+
+  return weightedSum / weightSum;
+};