Mengidentifikasi nilai hilang

Attrisi adalah isu penting bagi perusahaan, karena kehilangan seorang karyawan tidak hanya menimbulkan biaya untuk merekrut dan melatih pengganti, tetapi juga berarti hilangnya pengetahuan tacit dan budaya yang sulit dipulihkan.

Himpunan data attrition berisi informasi tentang attrisi karyawan termasuk Age, WorkLifeBalance, DistanceFromHome, StockOptionLevel, dan 27 variabel lainnya. Sebelum melanjutkan analisis, Anda ingin mendeteksi variabel yang memiliki nilai hilang.

Paket naniar dan himpunan data attrition sudah dimuat untuk Anda.

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# Explore missing data on the attrition dataset
___(attrition)

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Latihan ini adalah bagian dari kursus

Rekayasa Fitur di R

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Mulai Kursus Gratis

Raw data does not always come in its best shape for analysis. In this opening chapter, you will get a first look at how to transform and create features that enhance your model's performance and interpretability.

Exercise 1: Apa itu feature engineering?Exercise 2: Model awal Exercise 3: Merekayasa fitur secara manual Exercise 4: Membuat fitur baru menggunakan pengetahuan domain Exercise 5: Menyiapkan data Anda untuk analisis Exercise 6: Membangun workflow Exercise 7: Meningkatkan kandungan informasi dari data mentah Exercise 8: Mengidentifikasi nilai hilang

Latihan Saat Ini

Exercise 9: Mengimputasi nilai hilang dan membuat variabel dummy Exercise 10: Melatih dan menilai model Exercise 11: Memprediksi pemesanan hotel

In this chapter, you’ll learn that, beyond manually transforming features, you can leverage tools from the tidyverse to engineer new variables programmatically. You’ll explore how this approach improves your models' reproducibility and is especially useful when handling datasets with many features.

Exercise 1: Why transform existing features?Exercise 2: Glancing at your data Exercise 3: Normalizing and log-transforming Exercise 4: Fit and augment Exercise 5: Customize your model assessment Exercise 6: Common feature transformations Exercise 7: Common transformations Exercise 8: Plain recipe Exercise 9: Box-Cox transformation Exercise 10: Yeo-Johnson transformation Exercise 11: Advanced transformations Exercise 12: Baseline Exercise 13: step_poly()Exercise 14: step_percentile()Exercise 15: Who's staying?

You’ll now learn how models often benefit from reducing dimensionality and extracting features from high-dimensional data, including converting text data into numeric values, encoding categorical data, and ranking the predictive power of variables. You’ll explore methods including principal component analysis, kernel principal component analysis, numerical extraction from text, categorical encodings, and variable importance scores.

Exercise 1: Reducing dimensionality Exercise 2: Prepping the stage Exercise 3: Digging into the structure Exercise 4: Percent of variance explained Exercise 5: Visualizing variance explained Exercise 6: Feature hashing Exercise 7: Investigating education field Exercise 8: Into the matrix Exercise 9: Exploring the hashing Exercise 10: Visualizing the hashing Exercise 11: Encoding categorical data using supervised learning Exercise 12: Setting up your workflow Exercise 13: Fitting, augmenting, and assessing Exercise 14: Binding models together Exercise 15: Variable Importance Exercise 16: Create a workflow Exercise 17: Fit and augment Exercise 18: Which is the main predictor?

You’ll wrap up the course by learning about feature engineering and machine learning techniques. You’ll begin by focusing on the problems associated with using all available features in a model and the importance of identifying irrelevant and redundant features and learning to remove these features using embedded methods such as lasso and elastic-net. Next, you’ll explore shrinkage methods such as lasso, ridge, and elastic-net, which can be used to regularize feature weights or select features by setting coefficients to zero. Finally, you’ll finish by focusing on creating an end-to-end feature engineering workflow and reviewing and practicing the previously learned concepts and functions in a small project.

Exercise 1: Reducing the model's features Exercise 2: Sifting through variable importance Exercise 3: Assessing model performance using all available predictors Exercise 4: Building a reduced model Exercise 5: Shrinkage methods Exercise 6: Manual regularization with Lasso Exercise 7: Tuning the penalty Exercise 8: Finalizing the model Exercise 9: Putting it all together Exercise 10: Prep and split Exercise 11: Preprocess Exercise 12: Model Exercise 13: Assess Exercise 14: Congratulations!