Checks that a survey fulfills all the requirements to work with the 'contact_matrix' function
# S3 method for survey
check(
x,
id.column = "part_id",
participant.age.column = "part_age",
country.column = "country",
year.column = "year",
contact.age.column = "cnt_age",
...
)invisibly returns a character vector of the relevant columns
A survey() object
the column in both the participants and contacts data frames that links contacts to participants
the column in the participants data frame containing participants' age; if this does not exist, at least columns "..._exact", "..._est_min" and "..._est_max" must (see the estimated.participant.age option in contact_matrix())
the column in the participants data frame containing the country in which the participant was queried
the column in the participants data frame containing the year in which the participant was queried
the column in the contacts data frame containing the age of contacts; if this does not exist, at least columns "..._exact", "..._est_min" and "..._est_max" must (see the estimated.contact.age option in contact_matrix())
ignored