From f2b97e1df59c970b57dd1628d599a1ad53db7955 Mon Sep 17 00:00:00 2001
From: Jakob Langdal <jakob.langdal@alexandra.dk>
Date: Thu, 2 Jul 2026 21:21:29 +0000
Subject: [PATCH] fix(core): format 95% CI as [lower to upper] to match the 1D
 plots

---
 .changeset/ci-interval-to-format.md                  | 6 ++++++
 packages/core/src/common/util/scores/quality.test.ts | 2 +-
 packages/core/src/common/util/scores/quality.ts      | 4 ++--
 3 files changed, 9 insertions(+), 3 deletions(-)
 create mode 100644 .changeset/ci-interval-to-format.md

diff --git a/.changeset/ci-interval-to-format.md b/.changeset/ci-interval-to-format.md
new file mode 100644
index 00000000..1383d913
--- /dev/null
+++ b/.changeset/ci-interval-to-format.md
@@ -0,0 +1,6 @@
+---
+'@boostv/process-optimizer-frontend-core': patch
+'@boostv/process-optimizer-frontend-plots': patch
+---
+
+Format 95% credible intervals as [lower to upper] instead of [lower, upper], matching the 1D plots' hover format. Applies to the pareto front hover label and the credible-interval column under the plots (the plots package inlines these helpers and is republished to pick up the change).
diff --git a/packages/core/src/common/util/scores/quality.test.ts b/packages/core/src/common/util/scores/quality.test.ts
index e5c71eea..3fc17e75 100644
--- a/packages/core/src/common/util/scores/quality.test.ts
+++ b/packages/core/src/common/util/scores/quality.test.ts
@@ -10,7 +10,7 @@ describe('displayQuality', () => {
 
 describe('displayQualityCI', () => {
   it('returns a 95% CI string from a negated value and std dev', () => {
-    expect(displayQualityCI(-2, 0.5)).toBe('[1.02, 2.98]')
+    expect(displayQualityCI(-2, 0.5)).toBe('[1.02 to 2.98]')
   })
 
   it('returns an empty string when value or stdDev is missing/zero', () => {
diff --git a/packages/core/src/common/util/scores/quality.ts b/packages/core/src/common/util/scores/quality.ts
index 39fd684c..2c80cebf 100644
--- a/packages/core/src/common/util/scores/quality.ts
+++ b/packages/core/src/common/util/scores/quality.ts
@@ -8,7 +8,7 @@ export const displayQualityCI = (value: number, stdDev: number): string => {
   }
   const lower = -value - 1.96 * stdDev
   const upper = -value + 1.96 * stdDev
-  return `[${lower.toFixed(2)}, ${upper.toFixed(2)}]`
+  return `[${lower.toFixed(2)} to ${upper.toFixed(2)}]`
 }
 
 // Cost is stored as-is (not negated), so its 95% CI is value ± 1.96·σ with no
@@ -19,5 +19,5 @@ export const displayCostCI = (value: number, stdDev: number): string => {
   }
   const lower = value - 1.96 * stdDev
   const upper = value + 1.96 * stdDev
-  return `[${lower.toFixed(2)}, ${upper.toFixed(2)}]`
+  return `[${lower.toFixed(2)} to ${upper.toFixed(2)}]`
 }