January 2010
Beginner
480 pages
15h 36m
Portuguese (Portugal, Brazil)
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experiências
você está aqui
47
diagrama causal
Estudos observacionais são
cheios de confusão
Uma variável de confusão é a
diferença entre as pessoas do seu
estudo, ao invés do fator que você
está tentando comparar, que acaba
deixando os seus resultados menos
sensíveis.
Neste caso, você está comparando
os clientes Starbuzz entre si em
diferentes períodos de tempo.
Obviamente, os clientes Starbuzz
são todos diferentes — eles são
pessoas diferentes.
Mas se eles são diferentes entre si
em relação a uma das variáveis que
você está tentando entender, então,
essa diferença é uma variável de
confusão. E, neste caso, a variável é
a localização.
Redesenhe ...
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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.