Tetap teratur dengan koleksi
Simpan dan kategorikan konten berdasarkan preferensi Anda.
Praktisi ML menghabiskan lebih banyak waktu untuk mengevaluasi, membersihkan, dan mengubah
data daripada membuat model.
Data sangat penting sehingga kursus ini menyediakan tiga unit lengkap untuk topik ini:
Unit ini berfokus pada
data numerik,
yang berarti bilangan bulat atau nilai floating point
yang berperilaku seperti angka. Artinya, data tersebut bersifat aditive, dapat dihitung, teratur,
dan sebagainya. Unit berikutnya berfokus pada
data kategoris, yang dapat
menyertakan angka yang berperilaku seperti kategori. Unit ketiga berfokus pada cara
mempersiapkan data Anda untuk memastikan hasil yang berkualitas tinggi saat melatih dan mengevaluasi
model Anda.
Contoh data numerik meliputi:
Suhu
Berat
Jumlah rusa yang musim dingin di cagar alam
Sebaliknya, kode pos AS, meskipun
angka yang terdiri dari lima digit atau sembilan digit, tidak berperilaku seperti angka atau mewakili
hubungan matematis. Kode pos 40004 (di Nelson County, Kentucky) adalah
tidak dua kali lipat jumlah kode pos 20002 (di Washington, D.C.). Angka ini
merepresentasikan kategori, khususnya area geografis, dan dianggap
data kategorik.
[null,null,["Terakhir diperbarui pada 2025-07-27 UTC."],[[["\u003cp\u003eThis module focuses on preparing numerical data, such as temperature or weight, for use in machine learning models.\u003c/p\u003e\n"],["\u003cp\u003eMachine learning practitioners spend significant time on data preparation tasks like cleaning and transformation.\u003c/p\u003e\n"],["\u003cp\u003eThe module covers techniques like feature scaling, outlier detection, and binning to improve data quality for model training.\u003c/p\u003e\n"],["\u003cp\u003eLearners should have a basic understanding of machine learning concepts before starting this module.\u003c/p\u003e\n"],["\u003cp\u003eCategorical data, like postal codes, will be addressed in a separate module due to its distinct characteristics and handling requirements.\u003c/p\u003e\n"]]],[],null,["# Working with numerical data\n\n| **Estimated module length:** 85 minutes\n| **Learning objectives**\n|\n| - Understand feature vectors.\n| - Explore your dataset's potential features visually and mathematically.\n| - Identify outliers.\n| - Understand four different techniques to normalize numerical data.\n| - Understand binning and develop strategies for binning numerical data.\n| - Understand the characteristics of good continuous numerical features.\n| **Prerequisites:**\n|\n| This module assumes you are familiar with the concepts covered in the\n| following module:\n|\n| - [Introduction to Machine Learning](/machine-learning/intro-to-ml)\n\nML practitioners spend far more time evaluating, cleaning, and transforming\ndata than building models.\nData is so important that this course devotes three entire units to the topic:\n\n- Working with numerical data (this unit)\n- [Working with categorical data](/machine-learning/crash-course/categorical-data)\n- [Datasets, generalization, and overfitting](/machine-learning/crash-course/overfitting)\n\nThis unit focuses on\n[**numerical data**](/machine-learning/glossary#numerical-data),\nmeaning integers or floating-point values\nthat behave like numbers. That is, they are additive, countable, ordered,\nand so on. The next unit focuses on\n[**categorical data**](/machine-learning/glossary#categorical-data), which can\ninclude numbers that behave like categories. The third unit focuses on how to\nprepare your data to ensure high-quality results when training and evaluating\nyour model.\n\nExamples of numerical data include:\n\n- Temperature\n- Weight\n- The number of deer wintering in a nature preserve\n\nIn contrast, US postal codes, despite\nbeing five-digit or nine-digit numbers, don't behave like numbers or represent\nmathematical relationships. Postal code 40004 (in Nelson County, Kentucky) is\nnot twice the quantity of postal code 20002 (in Washington, D.C.). These numbers\nrepresent categories, specifically geographic areas, and are considered\ncategorical data.\n| **Key terms:**\n|\n| - [Categorical data](/machine-learning/glossary#categorical-data)\n- [Numerical data](/machine-learning/glossary#numerical-data) \n[Help Center](https://support.google.com/machinelearningeducation)"]]
