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How do you combine two data frame 10 Given a data table with column

How do you combine two data frame 10 Given a data table with column

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How do you combine two data.frame? 10. Given a

data.table with columns Speed, Color, and Time (question

regarding Table 2) how would you find the grand mean?

row averages? 11. For the previous question, what is the

function and formula to do an ANOVA on just on Color and

Speed and how it relates to Time?

Solution

For 9 Question answer following below:

Merge Two Data Frames

Description

Merge two data frames by common columns or row names,

or do other versions of database join operations.

Usage

Arguments

data frames, or objects to be coerced to one.

specifications of the columns used for merging. See

‘Details’.

logical; all = L is shorthand for all.x = L and all.y = L,

where L is either TRUE or FALSE.

logical; if TRUE, then extra rows will be added to the

output, one for each row in x that has no matching row in

y. These rows will have NAs in those columns that are

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usually filled with values from y. The default is FALSE, so

that only rows with data from both x and y are included in

the output.

logical; analogous to all.x.

logical. Should the result be sorted on the by columns?

a character vector of length 2 specifying the suffixes to be

used for making unique the names of columns in the result

which not used for merging (appearing in by etc).

values which cannot be matched. See match. This is

intended to be used for merging on one column, so these

are incomparable values of that column.

arguments to be passed to or from methods.

Details

merge is a generic function whose principal method is for

data frames: the default method coerces its arguments to

data frames and calls the \"data.frame\" method.

By default the data frames are merged on the columns with

names they both have, but separate specifications of the

columns can be given by by.x and by.y. The rows in the

two data frames that match on the specified columns are

extracted, and joined together. If there is more than one

match, all possible matches contribute one row each. For

the precise meaning of ‘match’, see match.

Columns to merge on can be specified by name, number or

by a logical vector: the name \"row.names\" or the number

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How do you combine two data.frame? 10. Given a data.table with columns Speed, Color, and Time (question regarding Table 2) how would you find the grand mean? row averages? 11. For the previous question, what is the function and formula to do an ANOVA on just on Color and Speed and how it relates to Time? Solution For 9 Question answer following below: Merge Two Data Frames Description Merge two data frames by common columns or row names, or do other versions of database join operations. Usage Arguments data frames, or objects to be coerced to one. specifications of the columns used for merging. See ‘Details’. logical; all = L is shorthand for all.x = L and all.y = L, where L is either TRUE or FALSE. logical; if TRUE, then extra rows will be added to t he output, one for each row in x that has no matching row in y. These rows will have NAs in those columns that are usually filled with values from y. The default is FALSE, so that only rows with data from both x and y are included in the output. logical; analogous to all.x. logical. Should the result be sorted on the by columns? a character vector of length 2 specifying the suffixes to be used for making unique the names of co ...
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