mean_table {meantables}

Estimate Mean and 95 Percent Confidence Intervals in dplyr Pipelines

Description

The mean_table function produces overall and grouped tables of means with related statistics. In addition to means, the mean_table missing/non-missing frequencies, the standard error of the mean (sem), the 95 value, and the maximum value. For grouped tibbles, mean_table displays these statistics for each category of the group_by variable.

Usage

mean_table(.data, .x, t_prob = 0.975, output = default, digits = 2, ...)

Arguments

.data

A tibble or grouped tibble.

.x

The continuous response variable for which the statistics are desired.

t_prob

(1 - alpha / 2). Default value is 0.975, which corresponds to an alpha of 0.05. Used to calculate a critical value from Student's t distribution with n - 1 degrees of freedom.

output

Options for this parameter are "default" and "all".

Default output includes the n, mean, sem, and 95 the mean. Using output = "all" also returns the the number of missing values for .x and the critical t-value.

digits

Round mean, lcl, and ucl to digits. Default is 2.

...

Other parameters to be passed on.

Value

A tibble of class "mean_table" or "mean_table_grouped"

References

SAS documentation: http://support.sas.com/documentation/cdl/en/proc/65145/HTML/default/viewer.htm#p0klmrp4k89pz0n1p72t0clpavyx.htm

Examples

## Not run: 
library(dplyr)
library(meantables)

data(mtcars)

# Overall mean table with defaults

mtcars %>%
  mean_table(mpg)

# A tibble: 1 x 9
  response_var     n  mean    sd   sem   lcl   ucl   min   max
  <chr>        <int> <dbl> <dbl> <dbl> <dbl> <dbl> <dbl> <dbl>
1 mpg             32  20.1  6.03  1.07  17.9  22.3  10.4  33.9

# Grouped means table with defaults

mtcars %>%
  group_by(cyl) %>%
  mean_table(mpg)

# A tibble: 3 x 11
  response_var group_var group_cat     n  mean    sd   sem   lcl   ucl   min   max
  <chr>        <chr>         <dbl> <int> <dbl> <dbl> <dbl> <dbl> <dbl> <dbl> <dbl>
1 mpg          cyl               4    11  26.7  4.51 1.36   23.6  29.7  21.4  33.9
2 mpg          cyl               6     7  19.7  1.45 0.549  18.4  21.1  17.8  21.4
3 mpg          cyl               8    14  15.1  2.56 0.684  13.6  16.6  10.4  19.2

## End(Not run)