diff --git a/4-data-analytics.md b/4-data-analytics.md
index f353c75..5791052 100644
--- a/4-data-analytics.md
+++ b/4-data-analytics.md
@@ -314,7 +314,7 @@
 - Square root $\sqrt{x}$
     - Similar to log transform
 - Exponential
-- Box cox transformation $x^(\lambda - 1) / \lambda$
+- Box cox transformation $(x^\lambda - 1)  / \lambda$
     - **prerequisite:** numeric values must be positive, can be solved by
       shifting
 - Quantile transformation: using quartiles