4.「ダーティー」なデータを「クリーン」にする from Coursera

What's inside

Syllabus

完全性の大切さ

このパートでは、データを準備する方法を考えるにあたり、なぜデータ完全性が優れた意思決定に重要であるかについてご説明します。データがどのように生成され、データアナリストが分析のために収集するデータを決定する際に活用する手法についても学びます。また、構造化データと非構造化データ、データ型、データフォーマットについても学びます。

クリーンデータの美しさ

データアナリストは皆、分析を行うさいにクリーンなデータを求めています。このパートでは、クリーンなデータとダーティなデータの違いについて学びます。また、表計算ソフトやその他のツールを使ったデータクリーニングのテクニックもご紹介します。

SQL でデータクリーニングをする

データクリーニングのさまざまな方法を知っておくと、データアナリストの仕事がぐっと楽になります。このパートでは、SQL を使用してデータクリーニングを行う方法を確認します。SQL で使えるクエリや関数を使って、データのクリーニングや変換を行い、分析に使える状態にする方法を探ります。

クリーニングの結果を検証し、レポートする

データのクリーニングは、データ分析プロセスにおいて不可欠なステップです。クリーニングの検証とレポートは、データが次のステップに進む準備ができていることを示す手段でもあります。このパートでは、データクリーニングの検証とレポート作成に関わるプロセスと、そのメリットについて学んでいきます。

オプション：レジュメにデータを追加する

効果的なレジュメを作成することは、データアナリティクスのキャリアを歩む上で役に立ちます。このパートでは、自分の長所と適用できる経験を強調するレジュメの作成に重点を置いて、求職活動のプロセスに関するあらゆることを学びます。まだ求人に応募していない方でも、この機会にぜひレジュメを充実させましょう。メジャーリーグでの初シーズンのスプリングトレーニングのように、これは見逃せないものです。

*コースチャレンジ*

用語集で用語と定義を確認し、コースチャレンジに備えましょう。その後、サンプルサイズの重要性、データの完全性、データとビジネス上の目的との関連性に関する知識を、クイズを通して実証しましょう。また、表計算ソフトと SQL の両方で、データクリーニングの技術を適用する機会もあります。最後に、データクリーニングのプロセスと結果を文書化し、レポートし、検証しましょう。

Good to know

Know what's good

, what to watch for

, and possible dealbreakers

初学者にデータアナリティクスの基礎を構築するのに役立つ

スプレッドシートやSQLを使用してデータのクリーンアップや変換を行う実践的なスキルを開発する

エントリーレベルのデータアナリスト職に応募するのに役立つ

Googleのデータアナリストが実際のアナリスト業務遂行方法を指導する

推奨事項に従うために他のコースを最初に取る必要がある

このコースの対象者は、データアナリティクスのキャリアでエントリーレベルの職に応募したい初心者である

Activities

Be better prepared before your course. Deepen your understanding during and after it. Supplement your coursework and achieve mastery of the topics covered in 4.「ダーティー」なデータを「クリーン」にする with these activities:

组织您的学习材料

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整理您的学习材料将帮助您轻松访问重要信息，从而提高您的学习效率。

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创建一个文件夹或笔记本来存放您的课程材料
整理您的笔记、作业和测验
创建一个包含相关资源链接的书签列表

回顾 SQL 基本知识

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复习 SQL 的基本知识将使您能够更有效地使用它来清理数据。

Browse courses on SQL

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阅读课程材料中有关 SQL 的部分
完成在线测验或练习题以测试您的 SQL 知识
查看有关 SQL 的在线教程或视频以获得额外的复习

了解 SQL 中的数据清理技术

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遵循教程来了解 SQL 中的数据清理技术将扩展您处理复杂数据集的能力。

Browse courses on SQL

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在课程材料或在线平台中找到有关 SQL 中数据清理的教程
安装必要的软件和设置数据库
按照教程中的说明操作，使用 SQL 命令清理数据
练习使用不同的 SQL 函数和查询来处理数据

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Career center

Learners who complete 4.「ダーティー」なデータを「クリーン」にする will develop knowledge and skills that may be useful to these careers:

Data Scientist

Data Scientists use data to build predictive models and make recommendations. They work with large datasets, using statistical analysis and machine learning techniques to identify patterns and trends. This course can help you become a Data Scientist by providing you with the skills you need to clean and prepare data for analysis. You will also learn how to use SQL to query databases and extract data.

See salaries and explore the career path for Data Scientist

Machine Learning Engineer

Machine Learning Engineers build and deploy machine learning models. They work with data analysts and data scientists to develop models that can solve business problems. This course can help you become a Machine Learning Engineer by providing you with the skills you need to clean and prepare data for analysis. You will also learn how to use SQL to query databases and extract data.

See salaries and explore the career path for Machine Learning Engineer

Business Analyst

Business Analysts use data to identify and solve business problems. They work with stakeholders to understand their needs and then use data to develop solutions. This course can help you become a Business Analyst by providing you with the skills you need to clean and prepare data for analysis. You will also learn how to use SQL to query databases and extract data.

See salaries and explore the career path for Business Analyst

Operations Research Analyst

Operations Research Analysts use data to improve the efficiency of operations. They work with data analysts and data scientists to develop models that can optimize processes. This course can help you become an Operations Research Analyst by providing you with the skills you need to clean and prepare data for analysis. You will also learn how to use SQL to query databases and extract data.

See salaries and explore the career path for Operations Research Analyst

Statistician

Statisticians use data to draw conclusions about the world. They work with data analysts and data scientists to develop models that can be used to make predictions. This course can help you become a Statistician by providing you with the skills you need to clean and prepare data for analysis. You will also learn how to use SQL to query databases and extract data.

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Software Engineer

Software Engineers design, develop, and maintain software applications. They work with data analysts and data scientists to build applications that use data to solve business problems. This course can help you become a Software Engineer by providing you with the skills you need to clean and prepare data for analysis. You will also learn how to use SQL to query databases and extract data.

See salaries and explore the career path for Software Engineer

Data Analyst

Data Analysts use their technical skills to extract meaningful insights from data. They typically work with large datasets, using statistical analysis and data mining techniques to identify trends and patterns. This course can help you become a Data Analyst by providing you with the skills you need to clean and prepare data for analysis. You will also learn how to use SQL to query databases and extract data.

See salaries and explore the career path for Data Analyst

Database Administrator

Database Administrators manage and maintain databases. They ensure that databases are available and accessible for users. This course can help you become a Database Administrator by providing you with the skills you need to clean and prepare data for analysis. You will also learn how to use SQL to query databases and extract data.

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Web Developer

Web Developers design and develop websites. They work with data analysts and data scientists to build websites that use data to provide insights to users. This course can help you become a Web Developer by providing you with the skills you need to clean and prepare data for analysis. You will also learn how to use SQL to query databases and extract data.

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Financial Analyst

Financial Analysts use data to make investment decisions. They work with data analysts and data scientists to develop models that can predict the performance of investments. This course can help you become a Financial Analyst by providing you with the skills you need to clean and prepare data for analysis. You will also learn how to use SQL to query databases and extract data.

See salaries and explore the career path for Financial Analyst

Data Engineer

Data Engineers design and build the systems that store and process data. They work with data analysts and data scientists to ensure that data is available and accessible for analysis. This course can help you become a Data Engineer by providing you with the skills you need to clean and prepare data for analysis. You will also learn how to use SQL to query databases and extract data.

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Data Visualization Specialist

Data Visualization Specialists create visual representations of data. They work with data analysts and data scientists to communicate insights to users. This course can help you become a Data Visualization Specialist by providing you with the skills you need to clean and prepare data for analysis. You will also learn how to use SQL to query databases and extract data.

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Actuary

Actuaries use data to assess risk. They work with data analysts and data scientists to develop models that can be used to price insurance policies and other financial products. This course can help you become an Actuary by providing you with the skills you need to clean and prepare data for analysis. You will also learn how to use SQL to query databases and extract data.

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Epidemiologist

Epidemiologists use data to investigate the causes of disease. They work with data analysts and data scientists to develop models that can be used to prevent and treat disease. This course can help you become an Epidemiologist by providing you with the skills you need to clean and prepare data for analysis. You will also learn how to use SQL to query databases and extract data.

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Market Researcher

Market Researchers use data to understand consumer behavior. They work with data analysts and data scientists to develop models that can identify trends and opportunities. This course can help you become a Market Researcher by providing you with the skills you need to clean and prepare data for analysis. You will also learn how to use SQL to query databases and extract data.

See salaries and explore the career path for Market Researcher