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R Data Mining

You're reading from   R Data Mining Implement data mining techniques through practical use cases and real-world datasets

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Product type Paperback
Published in Nov 2017
Publisher Packt
ISBN-13 9781787124462
Length 442 pages
Edition 1st Edition
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Author (1):
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Andrea Cirillo Andrea Cirillo
Author Profile Icon Andrea Cirillo
Andrea Cirillo
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Table of Contents (16) Chapters Close

Preface 1. Why to Choose R for Your Data Mining and Where to Start FREE CHAPTER 2. A First Primer on Data Mining Analysing Your Bank Account Data 3. The Data Mining Process - CRISP-DM Methodology 4. Keeping the House Clean – The Data Mining Architecture 5. How to Address a Data Mining Problem – Data Cleaning and Validation 6. Looking into Your Data Eyes – Exploratory Data Analysis 7. Our First Guess – a Linear Regression 8. A Gentle Introduction to Model Performance Evaluation 9. Don't Give up – Power up Your Regression Including Multiple Variables 10. A Different Outlook to Problems with Classification Models 11. The Final Clash – Random Forests and Ensemble Learning 12. Looking for the Culprit – Text Data Mining with R 13. Sharing Your Stories with Your Stakeholders through R Markdown 14. Epilogue
15. Dealing with Dates, Relative Paths and Functions

Applying the majority vote ensemble technique on predicted data


It is now time to finally draw our list, applying the majority vote technique we learned previously to our predictions. As done before, we are going to apply a threshold on values predicted from the logistic and SVM models, to map the original predictions on the [0,1] domain. Finally, with a piece of code really similar to the one we have seen before, let's  create an  ensemble_prediction attribute, storing a final prediction defined from results coming from the three estimated models:

me_customer_list %>% 
mutate(logistic_threshold = case_when(as.numeric(logistic)>0.5 ~ 1,
TRUE ~ 0),
svm_threshold = case_when(as.numeric(svm)>0.5 ~ 1,
TRUE ~ 0)) %>% 
mutate(ensemble_prediction = case_when(logistic_threshold+svm_threshold+ as.numeric(as.character(random_forest)) >=2 ~ 1,
TRUE ~ 0)) -> me_customer_list_complete

Is this the list the internal audit team needs from us?

Not quite; there is one more computation required...

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