Created
February 4, 2023 21:41
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R script for comparing two Astros pitchers post
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# load in required packages | |
library(dplyr) | |
library(ggplot2) | |
library(CalledStrike) | |
library(janitor) | |
library(ShinyBaseball) | |
library(readr) | |
# collect mlb ids from two pitchers | |
chadwick %>% | |
filter(name_first == "Cristian", | |
name_last == "Javier") %>% | |
pull(key_mlbam) -> cj_id | |
chadwick %>% | |
filter(name_first == "Framber", | |
name_last == "Valdez") %>% | |
pull(key_mlbam) -> fv_id | |
# read in 2022 Statcast data | |
statcast2022 <- read_csv("~/Dropbox/STATCAST/data/statcast2022.csv") | |
# collect data from two pitchers | |
statcast2022 %>% | |
filter(pitcher %in% c(cj_id, fv_id)) -> two_pitchers | |
two_pitchers %>% | |
mutate(Name = ifelse(pitcher == 664285, | |
"Valdez", "Javier")) -> two_pitchers | |
# table of pitch type and incidence of ground ball outs | |
two_pitchers %>% | |
mutate(GroundBall = ifelse(launch_angle <= 10 & | |
type == "X", | |
"Yes", "No")) -> | |
two_pitchers | |
two_pitchers %>% | |
filter(Name == "Valdez", type == "X", | |
is.na(GroundBall) == FALSE) %>% | |
tabyl(pitch_type, GroundBall) | |
two_pitchers %>% | |
filter(Name == "Javier", type == "X") %>% | |
tabyl(pitch_type, GroundBall) | |
# compute pitch values for all pitches | |
two_pitchers <- compute_pitch_values(two_pitchers) | |
# compare pitch locations | |
df1 <- filter(two_pitchers, | |
Name == "Javier", | |
pitch_type == "FF", | |
stand == "R") | |
df2 <- filter(two_pitchers, | |
Name == "Valdez", | |
pitch_type == "SI", | |
stand == "R") | |
df <- list(df1, df2) | |
names(df) <- c("Javier FF", "Valdez SI") | |
location_compare(df) | |
# compare contact rates | |
contact_swing_plot(df) | |
# compare launch angles and launch speeds of two pitches | |
df_new <- rbind(df1, df2) %>% | |
mutate(Type = paste(Name, pitch_type)) | |
df_new %>% | |
mutate(GroundBall = ifelse(launch_angle <= 10, | |
"Yes", "No")) -> df_new | |
ggplot(filter(df_new, type == "X", | |
is.na(GroundBall) == FALSE), | |
aes(launch_angle, launch_speed, | |
color = GroundBall)) + | |
geom_point() + | |
facet_wrap(~ Type, ncol = 1) + | |
increasefont() | |
# compare expected wOBA | |
woba_plot(df) | |
# pitch value comparison | |
pitch_value_contour(df, | |
title = "Pitch Value to Right-Handers") | |
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