Getting Started

Examples

Here you’ll find a series of example of calls to yf_get(). Most arguments are self-explanatory, but you can find more details at the help files.

The steps of the algorithm are:

check cache files for existing data
if not in cache, fetch stock prices from YF and clean up the raw data
write cache file if not available
calculate all returns
build diagnostics
return the data to the user

Fetching a single stock price

library(yfR)

# set options for algorithm
my_ticker <- 'GM'
first_date <- Sys.Date() - 30
last_date <- Sys.Date()

# fetch data
df_yf <- yf_get(tickers = my_ticker, 
                first_date = first_date,
                last_date = last_date)

# output is a tibble with data
head(df_yf)

## # A tibble: 6 × 11
##   ticker ref_date   price_open price_h…¹ price…² price…³ volume price…⁴ ret_ad…⁵
##   <chr>  <date>          <dbl>     <dbl>   <dbl>   <dbl>  <dbl>   <dbl>    <dbl>
## 1 GM     2022-10-19       33.8      34.2    33.3    33.6 1.03e7    33.6 NA      
## 2 GM     2022-10-20       33.7      34.2    33.1    33.4 1.36e7    33.4 -0.00565
## 3 GM     2022-10-21       33.5      35.0    33.3    35   1.41e7    35    0.0467 
## 4 GM     2022-10-24       34.9      35.9    34.5    35.7 1.86e7    35.7  0.0206 
## 5 GM     2022-10-25       36.5      37.5    35.8    37.0 2.55e7    37.0  0.0361 
## 6 GM     2022-10-26       37.4      38.3    37.2    37.9 1.96e7    37.9  0.0230 
## # … with 2 more variables: ret_closing_prices <dbl>,
## #   cumret_adjusted_prices <dbl>, and abbreviated variable names ¹price_high,
## #   ²price_low, ³price_close, ⁴price_adjusted, ⁵ret_adjusted_prices

Fetching many stock prices

library(yfR)
library(ggplot2)

my_ticker <- c('TSLA', 'GM', 'MMM')
first_date <- Sys.Date() - 100
last_date <- Sys.Date()

df_yf_multiple <- yf_get(tickers = my_ticker, 
                         first_date = first_date,
                         last_date = last_date)


p <- ggplot(df_yf_multiple, aes(x = ref_date, y = price_adjusted,
                                color = ticker)) + 
  geom_line()

p

Fetching daily/weekly/monthly/yearly price data

library(yfR)
library(ggplot2)
library(dplyr)

my_ticker <- 'GE'
first_date <- '2005-01-01'
last_date <- Sys.Date()

df_dailly <- yf_get(tickers = my_ticker, 
                    first_date, last_date, 
                    freq_data = 'daily') %>%
  mutate(freq = 'daily')

df_weekly <- yf_get(tickers = my_ticker, 
                    first_date, last_date, 
                    freq_data = 'weekly') %>%
  mutate(freq = 'weekly')

df_monthly <- yf_get(tickers = my_ticker, 
                     first_date, last_date, 
                     freq_data = 'monthly') %>%
  mutate(freq = 'monthly')

df_yearly <- yf_get(tickers = my_ticker, 
                    first_date, last_date, 
                    freq_data = 'yearly') %>%
  mutate(freq = 'yearly')

# bind it all together for plotting
df_allfreq <- bind_rows(
  list(df_dailly, df_weekly, df_monthly, df_yearly)
) %>%
  mutate(freq = factor(freq, 
                       levels = c('daily', 
                                  'weekly',
                                  'monthly',
                                  'yearly'))) # make sure the order in plot is right

p <- ggplot(df_allfreq, aes(x = ref_date, y = price_adjusted)) + 
  geom_line() + 
  facet_grid(freq ~ ticker) + 
  theme_minimal() + 
  labs(x = '', y = 'Adjusted Prices')

print(p)

Changing format to wide

library(yfR)
library(ggplot2)

my_ticker <- c('TSLA', 'GM', 'MMM')
first_date <- Sys.Date() - 100
last_date <- Sys.Date()

df_yf_multiple <- yf_get(tickers = my_ticker, 
                         first_date = first_date,
                         last_date = last_date)

print(df_yf_multiple)

## # A tibble: 213 × 11
##    ticker ref_date   price_open price_…¹ price…² price…³ volume price…⁴ ret_ad…⁵
##  * <chr>  <date>          <dbl>    <dbl>   <dbl>   <dbl>  <dbl>   <dbl>    <dbl>
##  1 GM     2022-08-10       37.7     38.5    37.5    38.0 1.07e7    37.9 NA      
##  2 GM     2022-08-11       38.7     39.0    38.2    38.5 1.02e7    38.4  1.34e-2
##  3 GM     2022-08-12       38.8     39.5    38.5    39.5 8.91e6    39.4  2.65e-2
##  4 GM     2022-08-15       38.9     39.7    38.8    39.4 9.63e6    39.3 -2.03e-3
##  5 GM     2022-08-16       39.0     39.6    38.7    39.0 1.39e7    38.9 -1.04e-2
##  6 GM     2022-08-17       38.2     38.7    37.7    38.4 1.07e7    38.3 -1.51e-2
##  7 GM     2022-08-18       38.3     38.9    38.1    38.7 7.00e6    38.6  8.33e-3
##  8 GM     2022-08-19       39.2     40.3    39.1    39.7 2.33e7    39.6  2.53e-2
##  9 GM     2022-08-22       38.2     38.8    37.9    38.5 2.09e7    38.5 -2.90e-2
## 10 GM     2022-08-23       39.0     39.4    38.4    38.6 1.54e7    38.5  2.59e-4
## # … with 203 more rows, 2 more variables: ret_closing_prices <dbl>,
## #   cumret_adjusted_prices <dbl>, and abbreviated variable names ¹price_high,
## #   ²price_low, ³price_close, ⁴price_adjusted, ⁵ret_adjusted_prices

l_wide <- yf_convert_to_wide(df_yf_multiple)

names(l_wide)

## [1] "price_open"             "price_high"             "price_low"             
## [4] "price_close"            "volume"                 "price_adjusted"        
## [7] "ret_adjusted_prices"    "ret_closing_prices"     "cumret_adjusted_prices"

prices_wide <- l_wide$price_adjusted
head(prices_wide)

## # A tibble: 6 × 4
##   ref_date      GM   MMM  TSLA
##   <date>     <dbl> <dbl> <dbl>
## 1 2022-08-10  37.9  146.  294.
## 2 2022-08-11  38.4  146.  287.
## 3 2022-08-12  39.4  149.  300.
## 4 2022-08-15  39.3  148.  309.
## 5 2022-08-16  38.9  147.  307.
## 6 2022-08-17  38.3  144.  304.

Getting Started

Marcelo Perlin

2022-11-18

Examples

Fetching a single stock price

Fetching many stock prices

Fetching daily/weekly/monthly/yearly price data

Changing format to wide