1 files changed, 1 insertions, 1 deletions

diff --git a/csv_tool b/csv_tool
index 96cd99e..17ad949 100755
--- a/csv_tool
+++ b/csv_tool
@@ -112,7 +112,7 @@ def numpy_lstsq(x, y):
     return lstsq(A, b)[0]
 
 def max_delta(c0, c1, x, y):
-    return max([abs(c0 + c1 * float(x) - float(y)) for (x,y) in izip(x, y)])
+    return max([float(y) - (c0 + c1 * float(x)) for (x,y) in izip(x, y)])
 
 def least_squares(rows, xy_pairs, upper_bound):
     cols = []