Book Image

Data Science with SQL Server Quick Start Guide

By : Dejan Sarka
Book Image

Data Science with SQL Server Quick Start Guide

By: Dejan Sarka

Overview of this book

SQL Server only started to fully support data science with its two most recent editions. If you are a professional from both worlds, SQL Server and data science, and interested in using SQL Server and Machine Learning (ML) Services for your projects, then this is the ideal book for you. This book is the ideal introduction to data science with Microsoft SQL Server and In-Database ML Services. It covers all stages of a data science project, from businessand data understanding,through data overview, data preparation, modeling and using algorithms, model evaluation, and deployment. You will learn to use the engines and languages that come with SQL Server, including ML Services with R and Python languages and Transact-SQL. You will also learn how to choose which algorithm to use for which task, and learn the working of each algorithm.
Table of Contents (15 chapters)
Title Page
Copyright and Credits
Packt Upsell
Contributors
Preface
Index

Predicting with logistic regression


The next step is to do some analytics also in R. I will start with logistic regression. First, we need to read the data in R:

library(RODBC)
con <- odbcConnect("AWDW", uid = "RUser", pwd = "Pa$$w0rd")
TM <-
 sqlQuery(con,
 "SELECT CustomerKey, CommuteDistance,
 TotalChildren, NumberChildrenAtHome, 
 Gender, HouseOwnerFlag,
 NumberCarsOwned, MaritalStatus,
 Age, Region, Income,
 Education, Occupation,
 BikeBuyer, TrainTest
 FROM dbo.TMTrain
 UNION
 SELECT CustomerKey, CommuteDistance,
 TotalChildren, NumberChildrenAtHome, 
 Gender, HouseOwnerFlag,
 NumberCarsOwned, MaritalStatus,
 Age, Region, Income,
 Education, Occupation,
 BikeBuyer, TrainTest
 FROM dbo.TMTEST")
close(con)

The next step, similar to Python, is to define the factors and their levels accordingly:

# Define Education as ordinal
TM$Education = factor(TM$Education, order = TRUE,
 levels = c("Partial High School",
 "High School", "Partial College",
 "Bachelors", "Graduate Degree"))
# Define...