From 1645f9721c85553df20fc98cccaca67706c1e9a9 Mon Sep 17 00:00:00 2001
From: rasbt <se.raschka@me.com>
Date: Thu, 17 Jul 2014 22:27:36 -0400
Subject: [PATCH] fixed typo in mean and stddev

---
 .../about_standardization_normalization.ipynb | 34 +++----------------
 1 file changed, 4 insertions(+), 30 deletions(-)

diff --git a/preprocessing/about_standardization_normalization.ipynb b/preprocessing/about_standardization_normalization.ipynb
index e0d515f..a51b9f7 100644
--- a/preprocessing/about_standardization_normalization.ipynb
+++ b/preprocessing/about_standardization_normalization.ipynb
@@ -1,7 +1,7 @@
 {
  "metadata": {
   "name": "",
-  "signature": "sha256:9d6725467e3a0fc9266227b3c66889bc02d07bdafb1e594f184cc73520fa0fd8"
+  "signature": "sha256:2a5a0eade9d92d1e9f450ec71f1ad8b87d45a87ce0571e182afd2fdf502ce7a7"
  },
  "nbformat": 3,
  "nbformat_minor": 0,
@@ -728,10 +728,12 @@
       "\n",
       "Min-Max scaling: \\begin{equation} X_{norm} = \\frac{X - X_{min}}{X_{max}-X_{min}} \\end{equation}\n",
       "\n",
-      "with\n",
+      "with mean:  \n",
       "\n",
       "\\begin{equation}\\mu = \\frac{1}{N} \\sum_{i=1}^N (x_i)\\end{equation}\n",
       "\n",
+      "and standard deviation:  \n",
+      "\n",
       "\\begin{equation}\\sigma = \\sqrt{\\frac{1}{N} \\sum_{i=1}^N (x_i - \\mu)^2}\\end{equation}\n",
       "\n"
      ]
@@ -1339,34 +1341,6 @@
      "source": [
       "As we can see, the standardization prior to the PCA definitely led to an decrease in the empirical error rate on classifying samples from test dataset."
      ]
-    },
-    {
-     "cell_type": "markdown",
-     "metadata": {},
-     "source": [
-      "$\\mu = 2$"
-     ]
-    },
-    {
-     "cell_type": "markdown",
-     "metadata": {},
-     "source": [
-      "$\\mu = 2$"
-     ]
-    },
-    {
-     "cell_type": "markdown",
-     "metadata": {},
-     "source": [
-      "\\begin{equation} \\mu = 2 \\end{equation}"
-     ]
-    },
-    {
-     "cell_type": "markdown",
-     "metadata": {},
-     "source": [
-      "\\begin{equation} \\mu = 2 \\end{equation}"
-     ]
     }
    ],
    "metadata": {}