Description Functions to create a survey object Functions to manipulate data in a survey object Functions to summarize a survey object

The srvyr package provides a new way of calculating summary statistics on survey data, based on the dplyr package. There are three stages to using srvyr functions, creating a survey object, manipulating the data, and calculating survey statistics.

`as_survey_design`

, `as_survey_rep`

,
and `as_survey_twophase`

are used to create surveys based on
a data.frame and design variables, replicate weights or two phase design
respectively. Each is based on a function in the survey package
(`svydesign`

, `svrepdesign`

,
`twophase`

), and it is easy to modify code that uses
the survey package so that it works with the srvyr package. See
`vignette("srvyr_vs_survey")`

for more details.

The function `as_survey`

will choose between the other three
functions based on the arguments given to save some typing.

Once you've created a survey object, you can manipulate the data as you would
using dplyr with a data.frame. `mutate`

modifies or creates a variable,
`select`

and `rename`

select or rename variables, and
`filter`

keeps certain observations.

Note that `arrange`

and two table verbs such as `bind_rows`

,
`bind_cosl`

, or any of the joins are not usable on survey objects
because they might require modificaitons to the definition of your survey. If
you need to use these variables, you should do so before you convert the
data.frame to a survey object.

Now that you have your data set up correctly, you can calculate summary
statistics. To get the statistic over the whole population, use
`summarise`

, or to calculate it over a set of groups, use
`group_by`

first.

You can calculate the mean, (with `survey_mean`

), the total
(`survey_total`

), the quantile (`survey_quantile`

),
or a ratio (`survey_ratio`

). By default, srvyr will return the
statistic and the standard error around it in a data.frame, but with the
`vartype`

parameter, you can also get a confidence interval ("ci"),
variance ("var"), or coefficient of variation ("cv").

Within summarise, you can also use `unweighted`

, which calculates
a function without taking into consideration the survey weighting.

srvyr documentation built on March 18, 2018, 1:23 p.m.

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