November 2023
Beginner to intermediate
344 pages
3h 47m
Korean
Content preview from 데이터 엔지니어를 위한 97가지 조언
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75 데이터 누락이 갖는 여러 가지 의미
에밀리 리더러(Emily Riederer)
누락 데이터는 전통적인 데이터 관리에서 가장 잘 탐구된 주제 중 하나일 것입니다. 널null 값 방지는 데이터베이스 제약을 설명하는 교과서적 예제이며, 널 감지 또한 데이터 유효성 검사의 전형적 예제입니다. 그렇지만 누락 데이터를 단순히 회피해서는 안 됩니다. 누락 데이터가 갖는 여러 의미를 고려하여 데이터 엔지니어는 어떻게 이를 인코딩하고 사용자에게 전달할지를 보다 신중하게 결정할 수 있습니다.
누락을 이분법적으로 생각하여 데이터의 존재 유무로 나누는 것은 꽤나 그럴듯해 보입니다. 그렇지만 이러한 관점은 널이 잠재적으로 포함한 정보를 무시합니다. 다양한 이유로 데이터가 누락될 수 있으며, 각각의 이유마다 분석을 어렵게 만드는 고유한 요소가 있습니다. 이를테면 다음과 같은 이유로 관측 변수가 누락된 것처럼 보일 수 있습니다.
• 변수의 참 값(true value)이 존재하지만 잘못 로드되었습니다.
• 변수의 참 값이 존재하지만 수집에서 의도적으로 제외되었습니다.
• 변수의 참 값이 존재하지만 알려지지 않았습니다.
• 해당 변수에 대한 적합한 값이 없습니다.
• 해당 변수에 대한 적합한 값이 널입니다.
온라인 이커머스 플랫폼에 등록한 사용자의 데이터셋을 ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.