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- df <- data.frame(hour=c(0.50,0.75,1.00,1.25,1.50,1.75,1.75,2.00,2.25,2.50,2.75,3.00,3.25,3.50,4.00,4.25,4.50,4.75,5.00,5.50), pass=c(0,0,0,0,0,0,1,0,1,0,1,0,1,0,1,1,1,1,1,1))
- df
- df$pass <- as.factor(df$pass)
- my_fit <- glm(df$pass ~ df$hour, data=df, na.action=na.exclude, family="binomial")
- summary(my_fit)
- my_table <- summary(my_fit)
- my_table$coefficients[,1] <- invlogit(coef(my_fit))
- my_table
- plot(df$hour, df$pass, xlab="x", ylab="logit values")
- LinearPredictions <- predict(my_fit); LinearPredictions
- EstimatedProbability.hat <- exp(LinearPredictions)/(1 + exp(LinearPredictions))
- EstimatedProbability.hat
- EstimatedProbability <- c(0.25, 0.50, 0.75) # Estimated probabilities for which their x levels are wanted to be found
- HoursStudied <- (log(EstimatedProbability/(1- EstimatedProbability)) - my_fit$coefficients[1])/ my_fit$coefficients[2]
- HoursStudied.summary <- data.frame(EstimatedProbability, HoursStudied)
- HoursStudied.summary
- EstimatedProbability HoursStudied
- #1 0.25 1.979936
- #2 0.50 2.710083
- #3 0.75 3.440230
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