diff --git a/test_synthetic.py b/test_synthetic.py
index 657690a..40ff082 100644
--- a/test_synthetic.py
+++ b/test_synthetic.py
@@ -11,7 +11,6 @@
 import time
 
 import numpy as np
-from stat_tests import friedman_test, nemenyi_multitest, bonferroni_dunn_test
 
 from cisc import cisc
 from crisp import crisp
@@ -677,8 +676,31 @@ def test_accuracy_alpha():
         sys.stdout.flus()
 
 
+def test_confounding():
+    nsim = 100
+    size = 1000
+    suppfzx = range(-7, 8)
+    suppfzy = range(-7, 8)
+    z = generate_X("uniform", size)
+    suppz = list(set(z))
+
+    fzx = map_randomly(suppz, suppfzx)
+    fzy = map_randomly(suppz, suppfzy)
+
+    nx = generate_additive_N(size)
+    ny = generate_additive_N(size)
+
+    x = [fzx[z[i]] + nx[i] for i in xrange(size)]
+    y = [fzy[z[i]] + ny[i] for i in xrange(size)]
+
+    print crisp(x, y)
+    print crisp(z, x)
+    print crisp(z, y)
+
+
 if __name__ == "__main__":
-    test_sample_size()
+    test_confounding()
+    # test_sample_size()
     # test_accuracy()
     # test_accuracy_alpha()
     # test_hypercompression()