diff --git a/README.md b/README.md
index da95839..db3c32b 100644
--- a/README.md
+++ b/README.md
@@ -44,17 +44,19 @@ composer require php-ai/php-ml
     * [Least Squares](http://php-ml.readthedocs.io/en/latest/machine-learning/regression/least-squares/)
     * [SVR](http://php-ml.readthedocs.io/en/latest/machine-learning/regression/svr/)
 * Clustering
-    * [k-Means](http://php-ml.readthedocs.io/en/latest/machine-learning/clustering/k-means)
-    * [DBSCAN](http://php-ml.readthedocs.io/en/latest/machine-learning/clustering/dbscan)
+    * [k-Means](http://php-ml.readthedocs.io/en/latest/machine-learning/clustering/k-means/)
+    * [DBSCAN](http://php-ml.readthedocs.io/en/latest/machine-learning/clustering/dbscan/)
+* Metric
+    * [Accuracy](http://php-ml.readthedocs.io/en/latest/machine-learning/metric/accuracy/)
 * Cross Validation
-    * [Random Split](http://php-ml.readthedocs.io/en/latest/machine-learning/cross-validation/random-split)
+    * [Random Split](http://php-ml.readthedocs.io/en/latest/machine-learning/cross-validation/random-split/)
 * Preprocessing
-    * [Normalization](http://php-ml.readthedocs.io/en/latest/machine-learning/preprocessing/normalization)
-    * [Imputation missing values](http://php-ml.readthedocs.io/en/latest/machine-learning/preprocessing/imputation-missing-values)
+    * [Normalization](http://php-ml.readthedocs.io/en/latest/machine-learning/preprocessing/normalization/)
+    * [Imputation missing values](http://php-ml.readthedocs.io/en/latest/machine-learning/preprocessing/imputation-missing-values/)
 * Feature Extraction
-    * [Token Count Vectorizer](http://php-ml.readthedocs.io/en/latest/machine-learning/feature-extraction/token-count-vectorizer)
+    * [Token Count Vectorizer](http://php-ml.readthedocs.io/en/latest/machine-learning/feature-extraction/token-count-vectorizer/)
 * Datasets
-    * [CSV](http://php-ml.readthedocs.io/en/latest/machine-learning/datasets/csv-dataset)
+    * [CSV](http://php-ml.readthedocs.io/en/latest/machine-learning/datasets/csv-dataset/)
     * Ready to use:
         * [Iris](http://php-ml.readthedocs.io/en/latest/machine-learning/datasets/demo/iris/)
         * [Wine](http://php-ml.readthedocs.io/en/latest/machine-learning/datasets/demo/wine/)
diff --git a/docs/index.md b/docs/index.md
index da95839..db3c32b 100644
--- a/docs/index.md
+++ b/docs/index.md
@@ -44,17 +44,19 @@ composer require php-ai/php-ml
     * [Least Squares](http://php-ml.readthedocs.io/en/latest/machine-learning/regression/least-squares/)
     * [SVR](http://php-ml.readthedocs.io/en/latest/machine-learning/regression/svr/)
 * Clustering
-    * [k-Means](http://php-ml.readthedocs.io/en/latest/machine-learning/clustering/k-means)
-    * [DBSCAN](http://php-ml.readthedocs.io/en/latest/machine-learning/clustering/dbscan)
+    * [k-Means](http://php-ml.readthedocs.io/en/latest/machine-learning/clustering/k-means/)
+    * [DBSCAN](http://php-ml.readthedocs.io/en/latest/machine-learning/clustering/dbscan/)
+* Metric
+    * [Accuracy](http://php-ml.readthedocs.io/en/latest/machine-learning/metric/accuracy/)
 * Cross Validation
-    * [Random Split](http://php-ml.readthedocs.io/en/latest/machine-learning/cross-validation/random-split)
+    * [Random Split](http://php-ml.readthedocs.io/en/latest/machine-learning/cross-validation/random-split/)
 * Preprocessing
-    * [Normalization](http://php-ml.readthedocs.io/en/latest/machine-learning/preprocessing/normalization)
-    * [Imputation missing values](http://php-ml.readthedocs.io/en/latest/machine-learning/preprocessing/imputation-missing-values)
+    * [Normalization](http://php-ml.readthedocs.io/en/latest/machine-learning/preprocessing/normalization/)
+    * [Imputation missing values](http://php-ml.readthedocs.io/en/latest/machine-learning/preprocessing/imputation-missing-values/)
 * Feature Extraction
-    * [Token Count Vectorizer](http://php-ml.readthedocs.io/en/latest/machine-learning/feature-extraction/token-count-vectorizer)
+    * [Token Count Vectorizer](http://php-ml.readthedocs.io/en/latest/machine-learning/feature-extraction/token-count-vectorizer/)
 * Datasets
-    * [CSV](http://php-ml.readthedocs.io/en/latest/machine-learning/datasets/csv-dataset)
+    * [CSV](http://php-ml.readthedocs.io/en/latest/machine-learning/datasets/csv-dataset/)
     * Ready to use:
         * [Iris](http://php-ml.readthedocs.io/en/latest/machine-learning/datasets/demo/iris/)
         * [Wine](http://php-ml.readthedocs.io/en/latest/machine-learning/datasets/demo/wine/)
diff --git a/mkdocs.yml b/mkdocs.yml
index f833fc3..68e8b97 100644
--- a/mkdocs.yml
+++ b/mkdocs.yml
@@ -12,8 +12,13 @@ pages:
     - Clustering:
       - KMeans: machine-learning/clustering/k-means.md
       - DBSCAN: machine-learning/clustering/dbscan.md
+    - Metric:
+      - Accuracy: machine-learning/metric/accuracy.md
     - Cross Validation:
       - RandomSplit: machine-learning/cross-validation/random-split.md
+    - Preprocessing:
+      - Normalization: machine-learning/preprocessing/normalization.md
+      - Imputation missing values: machine-learning/preprocessing/imputation-missing-values.md
     - Feature Extraction:
       - Token Count Vectorizer: machine-learning/feature-extraction/token-count-vectorizer.md
     - Datasets:
@@ -21,9 +26,10 @@ pages:
       - CSV Dataset: machine-learning/datasets/csv-dataset.md
       - Ready to use datasets:
         - Iris: machine-learning/datasets/demo/iris.md
-    - Metric:
-      - Accuracy: machine-learning/metric/accuracy.md
+        - Wine: machine-learning/datasets/demo/wine.md
+        - Glass: machine-learning/datasets/demo/glass.md
   - Math:
     - Distance: math/distance.md
     - Matrix: math/matrix.md
+    - Statistic: math/statistic.md
 theme: readthedocs