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memorize.ai (lvl 286)

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Section 1

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R Programming Language

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Last updated

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Date created

Mar 1, 2020

Cards (26)

Section 1

(26 cards)

tail()

Front

shows last observations in data frame

Back

ordinal variable

Front

a categorical variable in which the categories have a natural order

Back

order()

Front

sorts data according to certain variables in data set

Back

rbind

Front

merges matrices and/or vectors by row

Back

colSums()

Front

adds total of column

Back

square brackets

Front

reference data from frame columns use to select one or multiple elements from matrix

Back

continuous variable

Front

can respond to infinite number of values

Back

parentheses

Front

create vectors

Back

lists

Front

gather a variety of objects under one name in ordered way

Back

factors

Front

statistical data type used to store categorical variables

Back

rowSums()

Front

adds total of row

Back

logical

Front

Boolean values

Back

cbind()

Front

merges matrices and/or vectors by column

Back

[[ ]]

Front

grabs components of list

Back

list()

Front

creates list add components using c() and original list name

Back

str()

Front

shows structure of data set

Back

matrix

Front

collection of elements of some data type 2D

Back

subset()

Front

finds subset of data

Back

numerics

Front

decimal values like 4.5

Back

head()

Front

shows first observations in data frame

Back

categorical variable

Front

can only belong to limited number of categories

Back

characters

Front

text (or string)

Back

data.frame()

Front

constructs a data frame

Back

integers

Front

natural numbers like 4 (shares with other term)

Back

nominal variable

Front

categorical variables for which the categories do not have a natural ordering

Back

data frames

Front

has variables of data set as columns and observations as rows able to use type when selecting specific data

Back