buildCDClinks: Build CDC link

In nealhaddaway/CDCscraper: Scrapes Citation Information From the website for the Centers for Disease Control and Prevention

Description

Constructs series of CDC website search page URLs

Usage

buildCDClinks(
  and_terms = "",
  not_terms = "",
  exact_phrase = "",
  or_terms = "",
  date_from = "",
  date_to = "",
  pages = 1,
  start_page = 1,
  language = ""
)

Arguments

and_terms	Vector of alphanumeric terms searched using the AND Boolean operator, specified by the CDC as 'with all of the words'.
not_terms	Vector of alphanumeric terms searched using the NOT Boolean operator, specified by the CDC as 'without the words'.
exact_phrase	Vector of alphanumeric terms enclosed in inverted commas and searched as phrases (e.g. "large cat"), specified by the CDC as 'with the exact phrase'.
or_terms	Vector of alphanumeric terms searched using the OR Boolean operator, specified by the CDC as 'with at least one of the words'.
date_from	The date (e.g. 01/01/2000) from which searching will be performed (inclusive). If no value provided, all dates are searched.
date_to	The date (e.g. 01/10/2020) to which searching will be performed (inclusive). If no value provided, all dates are searched.
pages	Integer for the number of pages of search results to be returned (one link per page). The default value is 1.
start_page	Integer specifying which page(s) of search results should be displayed. If multiple pages are selected, multiple URLs are returned, one for each page of ten search results.
language	Two-letter language code for search language. The default is 'en' (English).

Details

Function takes as input a partial Boolean search string and produces a functioning (set of) URLs; one for each page og search results on the CDC website.

Value

A link containing the specified search results. A text file is saved to the working directory containing a report of the links generated and the input variables used.

Examples

and_terms <- c('disease', 'spread')
not_terms <- c('animal', 'fish')
exact_phrase <- c('corona virus')
or_terms <- c('pandemic', 'global')
date_from <- '01/01/1980'
date_to <- '10/11/2020'
links <- buildCDClinks(and_terms = and_terms,
    not_terms = not_terms,
    exact_phrase = exact_phrase,
    or_terms = or_terms,
    date_from = date_from,
    date_to = date_to,
    pages = 3)
links;

nealhaddaway/CDCscraper documentation built on Oct. 21, 2020, 5:20 a.m.