August 2022
Beginner to intermediate
436 pages
9h 43m
Korean
Content preview from SQL로 시작하는 데이터 분석
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371
7
장
실험 분석
TIP
대부분의 데이터베이스에서는 날짜와 관련된 연산에서
‘
2020
-
01
-
13
’
과 같이 날짜 형식으로 구성된 문자열
을 사용하더라도 이를 날짜 타입의 값으로 인식하고 연산을 수행합니다. 만약 여러분이 사용하는 데이터베이
스에서 날짜 형식의 문자열을 날짜 타입의 값으로 인식하지 못하고 오류가 발생한다면 다음 중 한 가지 방법
을 사용해 날짜 연산을 수행하기 바랍니다.
cast(‘2020-01-13’ as date)
date(‘2020-01-13’)
‘2020-01-13’::date
체크 박스 기본값 변경 전 사용자의 이메일 수신 동의율은
58
.
75
%로, 변경 후 사용자의 동의
율
40
.
64
%보다 훨씬 높습니다. 이 결과를 온라인 통계 서비스를 통해 통계 검정을 해보면,
‘
pre
’
그룹의 이메일 수신 동의율이
‘
post
’
그룹의 동의율보다 통계적으로 유의미하게 높습
니다. 만약 이메일 수신 동의 여부를 묻는 체크 박스의 기본값을 해제 상태로 변경한 이유가 별
도의 규정이나 정책 때문이라면, 이러한 결과에도 불구하고 게임 회사 입장에서는 달리 취할
방안이 없을 수도 있습니다. 다른 방법을 동원해서라도 이메일 수신 동의율을 높이는 일이 중
요하다면, 샘플 콘텐츠나 이메일 프로그램에 대한 정보 등을 제공하고 실험을 통해 그 효과를
확인해보는 방법도
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and much more.
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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.