# Fetch Data
qb_stats_w_combine <- read.csv("../data/qb_stats_w_combine.csv")
# Grab the college predictors
predictors <- c("height", "weight", "age", "c_avg_cmpp", "c_rate", "c_pct",
"c_avg_inter", "c_avg_tds", "c_avg_yds", "c_numyrs", "c_avg_att", "X40",
"wonderlic", "cone", "shuttle", "vert_leap", "broad_jump")
college_stats = qb_stats_w_combine[, predictors]
# Set the resopnse variables
win_pct = qb_stats_w_combine["wins"]/qb_stats_w_combine["games_started"]
# Establish the cost function
cost = function(r, pi = 0) mean(abs(r - pi) > 0.5)
# Generate clean data sets
bin_win_pct = ifelse(win_pct < 0.5, 0, 1)
data.w_combine.for_bin_win_pct = data.frame(na.omit(cbind(bin_win_pct, college_stats)))
# Logistic Regression
glm.w_combine.win_pct <- glm(formula = wins ~ ., data = data.w_combine.for_bin_win_pct,
family = binomial())
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exp(cbind(OR = coef(glm.w_combine.win_pct), confint(glm.w_combine.win_pct)))
## Waiting for profiling to be done...
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## OR 2.5 % 97.5 %
## (Intercept) 4.967e+25 9.030e-30 NA
## height 3.433e-02 NA 9.333e-01
## weight 2.331e+00 1.148e+00 NA
## age 7.142e-03 NA 5.842e-01
## c_avg_cmpp 5.364e-01 NA 1.167e+00
## c_rate 3.293e-01 NA 9.604e-01
## c_pct 7.931e+00 5.873e-01 NA
## c_avg_inter 3.460e-03 NA 6.783e-01
## c_avg_tds 7.487e+00 1.450e+00 NA
## c_avg_yds 1.038e+00 9.976e-01 NA
## c_numyrs 3.970e+03 1.940e+00 NA
## c_avg_att 1.134e+00 8.109e-01 2.166e+00
## X40 1.471e+08 4.882e-04 NA
## wonderlic 4.888e-01 NA 9.840e-01
## cone 1.286e+11 1.216e-02 NA
## shuttle 5.073e-13 NA 2.656e+04
## vert_leap 5.217e-01 1.443e-02 1.471e+00
## broad_jump 1.111e+00 6.061e-01 4.779e+00
win_pct.w_combine.cv <- cv.glm(data = data.w_combine.for_bin_win_pct, glmfit = glm.w_combine.win_pct,
cost, 5)
## Warning: glm.fit: algorithm did not converge
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win_pct.w_combine.cv.error <- win_pct.w_combine.cv$delta[2]
cat("Cross Validation Error\n", win_pct.w_combine.cv.error)
## Cross Validation Error
## 0.5588