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      Entrevista do cargo de Business Intelligence Engineer da empresa Amazon

      Pergunta de entrevista da empresa Amazon

      Entrevista para Business Intelligence Engineer

      How is variance calculated in a PCA?

      Respostas da entrevista

      Sigiloso

      4 de jun. de 2017

      For each principle component, the variances should be a linear combination of the variance of the variables that contracted this principle component.

      2

      Sigiloso

      19 de mar. de 2019

      Mathematically, Principal components are a linear combination of eigenvectors and all observations. So in some sense, by multiplying eigenvectors with observations of predictors we implicitly capture the variance.

      Sigiloso

      21 de mar. de 2017

      How can you sample data from a large dataset?

      2
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