The yfR Package
What is yfR?
If you are looking for data sources for your projects, I am sure that using financial data has come to your mind at some point. We are going to see how to make available to in R historical stock data.
yfR is a new package available in R that will simplify the financial data collection from Yahoo Finance.
You can find the source code at:
Previous work - BatchGetSymbols
Previously there author of this function created the package BatchGetSymbols, but now it has been improved https://github.com/msperlin/BatchGetSymbols.
Using the yfR Package
How to install yfR in RStudio
You can install yfR in R with any of the following commands:
# CRAN (stable)
install.packages('yfR')
# Github (dev version)
devtools::install_github('ropensci/yfR')
# ropensci
install.packages("yfR", repos = "https://ropensci.r-universe.dev")
Using yfR in R together with plotly
You can use yfR to query historical stock data in R the following way:
hist_price <- yf_get(tickers = test_ticker,
first_date= initial_date,
last_date= ending_date,
thresh_bad_data = 0.2,
freq_data="monthly") %>% select(ticker, price_close, ref_date)
hist_price$ym <- format(as.Date(hist_price$ref_date), "%Y-%m")
hist_price$Year <- as.integer(format(as.Date(hist_price$ref_date), "%Y"))
Then, just get some help from plotly to create one interactive visualization:
plot_ly(hist_price, type = 'scatter', mode = 'lines') %>%
add_trace(x = ~ym, y = ~price_close, name = ~ticker)