diff --git a/statistical_analysis/tests/data/sample_summary.csv b/statistical_analysis/tests/data/sample_summary.csv
new file mode 100644
index 0000000..1b72b77
--- /dev/null
+++ b/statistical_analysis/tests/data/sample_summary.csv
@@ -0,0 +1,9 @@
+t_publish,t_gate_read,t_index_visible,pinned_flag,timeouts,drift_signature
+10.2,15.1,99.8,True,0,stable
+11.0,16.0,102.5,False,1,minor_drift
+9.8,14.5,98.7,True,0,stable
+10.5,15.4,150.3,False,3,major_drift
+12.3,18.2,120.4,True,2,moderate_shift
+8.9,13.8,95.1,False,0,stable
+10.9,15.7,180.7,True,4,critical_drift
+9.7,14.6,100.3,False,1,minor_drift