Fix: Updated formulas in bestAo, currentAo, and getDeviation

src/lib/calculateBestAo.ts

@@ -1,5 +1,6 @@
 import { Solve } from "@/interfaces/Solve";
 import { sort } from "fast-sort";
+import calculateCurrentAo from "./calculateCurrentAo";
 
 export default function calculateBestAo(solves: Solve[], ao: number) {
   if (solves.length < ao) {
@@ -9,13 +10,8 @@ export default function calculateBestAo(solves: Solve[], ao: number) {
   const averages: number[] = [];
 
   for (let i = 0; i <= solves.length - ao; i++) {
-    const cubeAo = solves.slice(i, i + ao);
-    const sum = cubeAo.reduce(
-      (accumulator, currentValue) => accumulator + currentValue.time,
-      0
-    );
-    const average = sum / ao;
-    averages.push(average);
+    const currentAo = calculateCurrentAo(solves.slice(i, i + ao), ao);
+    averages.push(currentAo);
   }
 
   const averagesSorted = sort(averages).asc();

src/lib/calculateCurrentAo.ts

@@ -1,4 +1,5 @@
 import { Solve } from "@/interfaces/Solve";
+import { sort } from "fast-sort";
 
 export default function calculateCurrentAo(solves: Solve[], ao: number) {
   let result = 0;
@@ -7,10 +8,17 @@ export default function calculateCurrentAo(solves: Solve[], ao: number) {
   }
 
   const cubeAo = solves.slice(0, ao);
-  const sum = cubeAo.reduce(
+  // sort by fastest solve time
+  const sortedSolves = sort(cubeAo).asc((u) => u.time);
+  // remove best and worst time from array
+  const trimmedSolves = sortedSolves.slice(1, ao - 1);
+
+  const sum = trimmedSolves.reduce(
     (accumulator, currentValue) => accumulator + currentValue.time,
     0
   );
-  result = sum / ao;
+
+  // 2 balance the removed solves (best - worst)
+  result = sum / (ao - 2);
   return result;
 }

src/lib/getDeviation.ts

@@ -1,7 +1,7 @@
 import { Solve } from "@/interfaces/Solve";
 
 export default function getDeviation(solves: Solve[]) {
-  if (solves.length < 1) return 0;
+  if (solves.length < 2) return 0; // standard deviation require min 2 values
   const n = solves.length;
   const totalSolves = solves.reduce(
     (acumulador, solve) => acumulador + solve.time,
@@ -14,7 +14,7 @@ export default function getDeviation(solves: Solve[]) {
     return acumulador + difference ** 2;
   }, 0);
 
-  const desvStandard = Math.sqrt(diff / n);
+  const desvStandard = Math.sqrt(diff / (n - 1));
 
   return desvStandard;
 }