rEHR (version 1.0)

extract_keywords: Function to extract rows from a lookup table based on keywords

Description

This function can be used to build draft clinical code lists based on a clinical or product lookup table and a set of keywords.

Usage

extract_keywords(lookup, keywords, keyword_field = "desc")

Arguments

lookup

a dataframe containing a lookup table

keywords

character vector containing the keyword terms to search for

keyword_field

character identifying the field in the lookup table to be searched for keywords

Value

a data frame subsetted by keyword

Details

See www.clinicalcodes.org for clinical code lists that have been used in previous studies

All keywords are collapsed together in an OR statement

Examples

## Not run: 
# keywords <- c('oral ulceration', 'mouth ulceration', 'aphthous ulceration', 
# 'oral aphthous ulceration','oral ulcer[s]?', 'mouth ulcer[s]?', 'aphthous ulcer[s]?', 
# 'aphthous stomatitis', "stomatitis", "aphthae", 'oral aphthous stomatitis', 
# 'oral aphthous ulcers', 'recurrent oral ulcers', 'recurrent mouth ulcers', 
# 'recurrent oral aphthous ulcers', 'recurrent aphthous ulcers', 'recurrent aphthous stomatitis', 
# 'recurrent oral aphthous stomatitis')
# a <- extract_keywords(medical, keywords)
# ## End(Not run)