crunch: addSummaryStat – R documentation

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addSummaryStat

Add summary statistics to a CrunchCube

Description

Use addSummaryStat() to add a summary statistic to a CrunchCube object. If not otherwise specified, the summary statistic will be mean and be placed at the bottom of the cube. You can change those defaults by passing any value you can use with SummaryStat() (e.g. position, categories, after).

Usage

addSummaryStat(cube, stat = c("mean", "median"), var, margin, ...)

Arguments

`cube`	a CrunchCube to add stats to
`stat`	a character with the summary statistic to include (default: "mean")
`var`	a character with the name of the dimension variable to add the summary statistic for generally the alias of the variable in Crunch, but might include Crunch functions like `rollup()`, `bin()`, etc.
`margin`	which margin should the summary statistic be applied for (used in the cases of categorical arrays where a variable might contribute more than one margin)
`...`	options to pass to `SummaryStat()` (e.g., position, after, etc.)

Value

a CrunchCube with the summary statistic Insertion added to the transforms of the variable specified

Examples

## Not run: 
pet_feelings
#                   animals
# feelings            cats dogs
#  extremely happy      9    5
#  somewhat happy      12   12
#  neutral             12    7
#  somewhat unhappy    10   10
#  extremely unhappy   11   12

# add a mean summary statistic to a CrunchCube
addSummaryStat(pet_feelings, stat = "mean", var = "feelings")
#                 animals
# feelings                      cats             dogs
#  extremely happy                9                5
#   somewhat happy               12               12
#          neutral               12                7
# somewhat unhappy               10               10
# extremely unhappy               11               12
#             mean 4.90740740740741 4.34782608695652

# we can also store the CrunchCube for use elsewhere
pet_feelings <- addSummaryStat(pet_feelings, stat = "mean", var = "feelings")
pet_feelings
#                 animals
# feelings                      cats             dogs
#  extremely happy                9                5
#   somewhat happy               12               12
#          neutral               12                7
# somewhat unhappy               10               10
# extremely unhappy               11               12
#             mean 4.90740740740741 4.34782608695652

# `addSummaryStat` returns a CrunchCube that has had the summary statistic
# added to it, so that you can still use the Crunch logic for multiple
# response variables, missingness, etc.
class(pet_feelings)
# [1] "CrunchCube"
# attr(,"package")
# [1] "crunch"

# Since `pet_feelings` is a CrunchCube, although it has similar properties
# and behaviors to arrays, it is not a R array:
is.array(pet_feelings)
# [1] FALSE

# cleanup transforms
transforms(pet_feelings) <- NULL
# add a median summary statistic to a CrunchCube
pet_feelings <- addSummaryStat(pet_feelings, stat = "median", var = "feelings")
pet_feelings
#                 animals
# feelings             cats    dogs
#  extremely happy       9       5
#   somewhat happy      12      12
#          neutral      12       7
# somewhat unhappy      10      10
# extremely unhappy      11      12
#           median       5       5

# additionally, if you want a true matrix object from the CrunchCube, rather
# than the CrunchCube object itself, `applyTransforms()` will return the
# array with the summary statistics (just like subtotals and headings)
pet_feelings_array <- applyTransforms(pet_feelings)
pet_feelings_array
#                 animals
# feelings             cats    dogs
#  extremely happy       9       5
#   somewhat happy      12      12
#          neutral      12       7
# somewhat unhappy      10      10
# extremely unhappy      11      12
#           median       5       5

# and we can see that this is an array and no longer a CrunchCube
is.array(pet_feelings_array)
# [1] TRUE

## End(Not run)

crunch

Crunch.io Data Tools

v1.28.0

LGPL (>= 3)

Authors

Greg Freedman Ellis [aut, cre], Jonathan Keane [aut], Mike Malecki [aut], Neal Richardson [aut], Gordon Shotwell [aut]

Initial release