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Data Analysis Using SQL and Excel

Data Analysis Using SQL and Excel - Second Edition

By : Gordon S. S. Linoff
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Data Analysis Using SQL and Excel

Data Analysis Using SQL and Excel

By: Gordon S. S. Linoff

Overview of this book

Data Analysis Using SQL and Excel, 2nd Edition shows you how to leverage the two most popular tools for data query and analysis—SQL and Excel—to perform sophisticated data analysis without the need for complex and expensive data mining tools. Written by a leading expert on business data mining, this book shows you how to extract useful business information from relational databases. You'll learn the fundamental techniques before moving into the "where" and "why" of each analysis, and then learn how to design and perform these analyses using SQL and Excel. Examples include SQL and Excel code, and the appendix shows how non-standard constructs are implemented in other major databases, including Oracle and IBM DB2/UDB. The companion website includes datasets and Excel spreadsheets, and the book provides hints, warnings, and technical asides to help you every step of the way. Data Analysis Using SQL and Excel, 2nd Edition shows you how to perform a wide range of sophisticated analyses using these simple tools, sparing you the significant expense of proprietary data mining tools like SAS.
Table of Contents (18 chapters)
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1
Foreword
17
EULA

Survival and Retention

Hazard probabilities measure the probability that someone succumbs to a risk at a given time. Survival is the probability that someone has not succumbed to the risk up to that time. In other words, survival accumulates information about hazards, or more specifically about the inverse of hazards.

Point Estimate for Survival

Survival at tenure t is the number of customers who are active at tenure t divided by the population at risk at tenure t. How many customers survived to at least tenure t, how many stopped, and what is the survival value? This question is easy to answer in SQL for any given tenure:

SELECT 100 as tenure, COUNT(*) as popatrisk,
       SUM(CASE WHEN Tenure < 100 AND StopType IS NOT NULL
                THEN 1 ELSE 0 END) as succumbtorisk,
       AVG(CASE WHEN tenure >= 100 OR StopType IS NULL
                THEN 1.0 ELSE 0 END) as s_100
FROM Subscribers
WHERE StartDate >= '2004-01-01' AND Tenure >= 0 AND
      StartDate &lt...
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Data Analysis Using SQL and Excel
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