From 16321a1f154793689cce5dadc63c9ce2290db145 Mon Sep 17 00:00:00 2001
From: Arda Korkmaz <143834039+Ardakorkmaz0@users.noreply.github.com>
Date: Mon, 30 Mar 2026 11:41:01 +0300
Subject: [PATCH 1/3] Add shifted function to calculate percentage difference

---
 Week03/shifted_arda_korkmaz.py | 12 ++++++++++++
 1 file changed, 12 insertions(+)
 create mode 100644 Week03/shifted_arda_korkmaz.py

diff --git a/Week03/shifted_arda_korkmaz.py b/Week03/shifted_arda_korkmaz.py
new file mode 100644
index 00000000..e569cb65
--- /dev/null
+++ b/Week03/shifted_arda_korkmaz.py
@@ -0,0 +1,12 @@
+def shifted(data):
+    if not data: return 0.0
+    n = len(data)
+    mean = sum(data) / n
+    s = sorted(data)
+    mid = n // 2
+    if n % 2 == 0:
+        median = (s[mid - 1] + s[mid]) / 2
+    else:
+        median = s[mid]
+    if median == 0: return 0.0
+    return ((mean - median) / median) * 100

From a65f5ff1cafcbf09f0a1310bec39360ea5e6fbd0 Mon Sep 17 00:00:00 2001
From: Arda Korkmaz <143834039+Ardakorkmaz0@users.noreply.github.com>
Date: Mon, 30 Mar 2026 11:43:46 +0300
Subject: [PATCH 2/3] Refactor shifted function for median calculation

---
 Week03/shifted_arda_korkmaz.py | 11 ++++-------
 1 file changed, 4 insertions(+), 7 deletions(-)

diff --git a/Week03/shifted_arda_korkmaz.py b/Week03/shifted_arda_korkmaz.py
index e569cb65..e8366e00 100644
--- a/Week03/shifted_arda_korkmaz.py
+++ b/Week03/shifted_arda_korkmaz.py
@@ -1,12 +1,9 @@
 def shifted(data):
-    if not data: return 0.0
     n = len(data)
+    if n == 0: return 0.0
     mean = sum(data) / n
     s = sorted(data)
     mid = n // 2
-    if n % 2 == 0:
-        median = (s[mid - 1] + s[mid]) / 2
-    else:
-        median = s[mid]
-    if median == 0: return 0.0
-    return ((mean - median) / median) * 100
+    res = (s[mid-1] + s[mid]) / 2 if n % 2 == 0 else s[mid]
+    if res == 0: return 0.0
+    return abs((mean - res) / res) * 100

From 8b40d31f2024dd3547279ae6df05900e0b853642 Mon Sep 17 00:00:00 2001
From: Arda Korkmaz <143834039+Ardakorkmaz0@users.noreply.github.com>
Date: Mon, 30 Mar 2026 11:45:45 +0300
Subject: [PATCH 3/3] Fix median calculation and zero check in function

---
 Week03/shifted_arda_korkmaz.py | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/Week03/shifted_arda_korkmaz.py b/Week03/shifted_arda_korkmaz.py
index e8366e00..f4b32066 100644
--- a/Week03/shifted_arda_korkmaz.py
+++ b/Week03/shifted_arda_korkmaz.py
@@ -4,6 +4,6 @@ def shifted(data):
     mean = sum(data) / n
     s = sorted(data)
     mid = n // 2
-    res = (s[mid-1] + s[mid]) / 2 if n % 2 == 0 else s[mid]
-    if res == 0: return 0.0
-    return abs((mean - res) / res) * 100
+    med = (s[mid-1] + s[mid]) / 2 if n % 2 == 0 else s[mid]
+    if mean == 0: return 0.0
+    return abs((mean - med) / mean) * 100