Apply it to your data 3

Which of your stock beat the market in 2025?

# Load packages
library(tidyverse)
library(tidyquant)

1 Get stock prices and convert to returns

Ra <- c("GOOGL", "PLTR", "NVDA") %>%
    tq_get(get  = "stock.prices",
           from = "2022-01-01") %>%
    group_by(symbol) %>%
    tq_transmute(select     = adjusted, 
                 mutate_fun = periodReturn, 
                 period     = "monthly", 
                 col_rename = "Ra")
Ra

## # A tibble: 141 × 3
## # Groups:   symbol [3]
##    symbol date             Ra
##    <chr>  <date>        <dbl>
##  1 GOOGL  2022-01-31 -0.0668 
##  2 GOOGL  2022-02-28 -0.00182
##  3 GOOGL  2022-03-31  0.0297 
##  4 GOOGL  2022-04-29 -0.179  
##  5 GOOGL  2022-05-31 -0.00305
##  6 GOOGL  2022-06-30 -0.0422 
##  7 GOOGL  2022-07-29  0.0675 
##  8 GOOGL  2022-08-31 -0.0696 
##  9 GOOGL  2022-09-30 -0.116  
## 10 GOOGL  2022-10-31 -0.0119 
## # ℹ 131 more rows

2 Get baseline and convert to returns

Rb <- "^IXIC" %>%
    tq_get(get  = "stock.prices",
           from = "2022-01-01") %>%
    tq_transmute(select     = adjusted, 
                 mutate_fun = periodReturn, 
                 period     = "monthly", 
                 col_rename = "Rb")
Rb

## # A tibble: 47 × 2
##    date            Rb
##    <date>       <dbl>
##  1 2022-01-31 -0.101 
##  2 2022-02-28 -0.0343
##  3 2022-03-31  0.0341
##  4 2022-04-29 -0.133 
##  5 2022-05-31 -0.0205
##  6 2022-06-30 -0.0871
##  7 2022-07-29  0.123 
##  8 2022-08-31 -0.0464
##  9 2022-09-30 -0.105 
## 10 2022-10-31  0.0390
## # ℹ 37 more rows

3 Join the two tables

RaRb <- left_join(Ra, Rb, by = c("date" = "date"))
RaRb

## # A tibble: 141 × 4
## # Groups:   symbol [3]
##    symbol date             Ra      Rb
##    <chr>  <date>        <dbl>   <dbl>
##  1 GOOGL  2022-01-31 -0.0668  -0.101 
##  2 GOOGL  2022-02-28 -0.00182 -0.0343
##  3 GOOGL  2022-03-31  0.0297   0.0341
##  4 GOOGL  2022-04-29 -0.179   -0.133 
##  5 GOOGL  2022-05-31 -0.00305 -0.0205
##  6 GOOGL  2022-06-30 -0.0422  -0.0871
##  7 GOOGL  2022-07-29  0.0675   0.123 
##  8 GOOGL  2022-08-31 -0.0696  -0.0464
##  9 GOOGL  2022-09-30 -0.116   -0.105 
## 10 GOOGL  2022-10-31 -0.0119   0.0390
## # ℹ 131 more rows

4 Calculate CAPM

RaRb_capm <- RaRb %>%
    tq_performance(Ra = Ra, 
                   Rb = Rb, 
                   performance_fun = table.CAPM)
RaRb_capm

## # A tibble: 3 × 18
## # Groups:   symbol [3]
##   symbol ActivePremium  Alpha AlphaRobust AnnualizedAlpha  Beta `Beta-`
##   <chr>          <dbl>  <dbl>       <dbl>           <dbl> <dbl>   <dbl>
## 1 GOOGL         0.0966 0.0091      0.0092           0.114 0.966   1.00 
## 2 PLTR          0.661  0.051       0.0182           0.816 1.96    0.881
## 3 NVDA          0.489  0.0306      0.0232           0.436 2.13    2.87 
## # ℹ 11 more variables: `Beta-Robust` <dbl>, `Beta+` <dbl>, `Beta+Robust` <dbl>,
## #   BetaRobust <dbl>, Correlation <dbl>, `Correlationp-value` <dbl>,
## #   InformationRatio <dbl>, `R-squared` <dbl>, `R-squaredRobust` <dbl>,
## #   TrackingError <dbl>, TreynorRatio <dbl>

Which stock has a positively skewed distribution of returns?

RaRb_capm <- RaRb %>%
    tq_performance(Ra = Ra, 
                   Rb = Rb, 
                   performance_fun = table.CAPM)
RaRb_capm

## # A tibble: 3 × 18
## # Groups:   symbol [3]
##   symbol ActivePremium  Alpha AlphaRobust AnnualizedAlpha  Beta `Beta-`
##   <chr>          <dbl>  <dbl>       <dbl>           <dbl> <dbl>   <dbl>
## 1 GOOGL         0.0966 0.0091      0.0092           0.114 0.966   1.00 
## 2 PLTR          0.661  0.051       0.0182           0.816 1.96    0.881
## 3 NVDA          0.489  0.0306      0.0232           0.436 2.13    2.87 
## # ℹ 11 more variables: `Beta-Robust` <dbl>, `Beta+` <dbl>, `Beta+Robust` <dbl>,
## #   BetaRobust <dbl>, Correlation <dbl>, `Correlationp-value` <dbl>,
## #   InformationRatio <dbl>, `R-squared` <dbl>, `R-squaredRobust` <dbl>,
## #   TrackingError <dbl>, TreynorRatio <dbl>