diff --git a/analytics.py b/analytics.py
new file mode 100644
index 0000000..083c0f6
--- /dev/null
+++ b/analytics.py
@@ -0,0 +1,24 @@
+def parse_csv_line(line, delimiter=','):
+    parts = line.strip().split(delimiter)
+    return [p.strip().strip('"') for p in parts]
+
+
+def compute_moving_average(values, window):
+    if window <= 0 or window > len(values):
+        raise ValueError("window must be between 1 and len(values)")
+    result = []
+    for i in range(len(values) - window + 1):
+        result.append(sum(values[i:i + window]) / window)
+    return result
+
+
+def group_by(items, key_fn):
+    groups = {}
+    for item in items:
+        k = key_fn(item)
+        groups.setdefault(k, []).append(item)
+    return groups
+
+
+def clamp(value, minimum, maximum):
+    return max(minimum, min(maximum, value))