Wiley StatsRef: Statistical Reference Online Contents

A comprehensive reference resource that covers the fundamentals of statistical methodology and theory as well as applications of statistics in all fields, including statistical methods within the fields of  finance and business.  
Wiley StatsRef articles cover a wide range of subjects and are divided into the following topics (number of articles in brackets):

• Applications (1734)
• Concepts, Definitions, and Formulae (733)
• History and Biography (280)
• Journals, Societies, and Agencies (31)
• Methods and Theory (3520)

Wiley StatsRef boasts a great diversity of articles, from Black Scholes Model, and Data Analysis to Risk Measurement and Modelling to Cluster Analysis and Likert Scale etc.

Articles have been selected from a range of standalone encyclopedias from Wiley:

• Encyclopedia of Actuarial Science
• Encyclopedia of Biostatistics
• Encyclopedia of Clinical Trials
• Encyclopedia of Environmetrics
• Encyclopedia of Quantitative Risk Analysis and Assessment
• Encyclopedia of Statistical Sciences
• Encyclopedia of Statistics in Behavioral Science
• Encyclopedia of Statistics in Quality and Reliability