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The Most wanted tutorials of last month are listed below (based on visitors statistics)
See also: List of tutorials
Numerical Excel
Various tutorials to solve analytical problems using MS Excel with and without programming.

KMeans
Clustering
Interesting algorithm to partition
your data. Resources to classification analysis, clustering analysis, data mining and free download code

Similarity Measurement
Basic knowledge on how to measure similarity and dissimilarity of performance index. Useful for clustering, Machine learning and data mining. Many simple examples.

Bootstrap Sampling
Powerful Monte Carlo method to estimate distribution from sample's statistics.

Visual
Basic (VB) tutorial
Step by step
guide to programming using Visual Basic for beginners 
Analytic Hierarchy Process
Analytic Hierarchy Process (AHP) is a famous method for multi criteria decision making analysis. Read more 
Regression Tutorial
An introduction to regression model using MS Excel. Learn how to model, find the bestfit model and use graph, functions, matrix and Add Ins to automate the regression.

KNearest Neighbor Algorithm
Supervised learning for classification in data mining and statistical pattern recognition. Free download. 
GIS Tutorial
Introduction to GIS with feature to use Arc GIS (Arc View, Arc Editor or Arc Info). Assumed you know nothing about GIS. 
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