nhanesAttr {nhanesA} | R Documentation |
Returns the attributes of an NHANES data table.
Description
Returns attributes such as number of rows, columns, and memory
size, but does not return the table itself. This function is
deprecated. Use nhanesTableSummary
instead.
Usage
nhanesAttr(nh_table)
Arguments
nh_table |
The name of the specific table to retrieve |
Details
nhanesAttr allows one to check the size and other charactersistics of a data table before importing into R. To retrieve these characteristics, the specified table is downloaded, characteristics are determined, then the table is deleted. Downloads a table from the NHANES website as is, i.e. in its entirety with no modification or cleansing.
If the environment variable NHANES_TABLE_BASE
was set
during startup, the value of this variable is used as the base
URL instead of https://wwwn.cdc.gov (this allows the use of
a local or alternative mirror of the CDC data).
Value
The following attributes are returned as a list
nrow = number of rows
ncol = number of columns
names = name of each column
unique = true if all SEQN values are unique
na = number of 'NA' cells in the table
size = total size of table in bytes
types = data types of each column
Examples
## Not run: bpx_e = nhanesAttr('BPX_E')
## Not run: length(bpx_e)
## Not run: folate_f = nhanesAttr('FOLATE_F')
## Not run: length(folate_f)