read_to_medcodes: Translate Read/Oxmis codes to CPRD medcodes
Description
This function accepts a data frame with a column for Read/Oxmis codes and merges with a medical lookup table to give columns for CPRD medcodes and optional descriptions
Usage
read_to_medcodes(readcodes_data, lookup_table, readcodes_name = "readcode", lookup_readcodes = "readcode", lookup_medcodes = "medcode", description)
Arguments
readcodes_data
a dataframe with a column matching medcodes_name
lookup_table
a dataframe with columns matching lookup_readcodes and lookup_medcodes
readcodes_name
character name of the Read codes column in readcodes_data
lookup_readcodes
character name of the Read codes column in the lookup_table
lookup_medcodes
character name of the CPRD medcodes column in the lookup_table
description
logical Should description and other categories from the lookup table also be included?
Value
a data frame matching the input medcodes_data with the Read codes and optional description columns merged in.
Details
Note that if the names of the Read/Oxmis codes columns are different in the data and the lookup table, the name in the data is retained
To maintain sanity, a warning will be given to inform of are any name conflicts between the input data and the lookup