stats

definition:

• a table of data is a data matrix(plural data matrices)

• each row in the table corresponds to a cas

  • one object you collect information about

• each column in a data matrix corresponds to a variable

  • a variable can be numerical or categorical

  • numerical quantitative variables

    • variables can be represented as a number, and it makes sense to do operations on them

    • age

    • heigh

    • NOT

      • phone number

      • zip codes

  • categorical is qualitative

    • have to do with categories like

      • shoe brand

      • state

      • year in college (Fr, So, Jr, Sr)

• relationship between variable

  • a pair of variables can be associated or independent

    • associated: one

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