April 2016
Intermediate to advanced
336 pages
7h 21m
Portuguese (Portugal, Brazil)
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CAPÍTULO 15
Regressão Múltipla
Eu não olho para um problema e coloco variáveis que não o afetam.
—Bill Parcells
Mesmo que a vice-presidente esteja impressionada com seu modelo preditivo, ela acha que você pode fazer melhor. Para isso, você colheu dados adicionais: para cada um dos seus usuários, você sabe quantas horas ele trabalha por dia e se ele tem um PhD. Você gostaria de usar esses dados adicionais para melhorar seu modelo.
Desta forma, você cria uma hipótese de um modelo linear com mais variáveis independentes:
Obviamente, se um usuário tem PhD não é um número, mas — como falamos no Capítulo 11 — nós podemos introduzir uma variável fictícia ...
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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.