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Project: Dr. Semmelweis and the Importance of Handwashing
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    Hungarian physician Dr. Ignaz Semmelweis worked at the Vienna General Hospital with childbed fever patients. Childbed fever is a deadly disease affecting women who have just given birth, and in the early 1840s, as many as 10% of the women giving birth died from it at the Vienna General Hospital. Dr.Semmelweis discovered that it was the contaminated hands of the doctors delivering the babies, and on June 1st, 1847, he decreed that everyone should wash their hands, an unorthodox and controversial request; nobody in Vienna knew about bacteria.

    You will reanalyze the data that made Semmelweis discover the importance of handwashing and its impact on the hospital.

    The data is stored as two CSV files within the data folder.

    yearly_deaths_by_clinic.csv contains the number of women giving birth at the two clinics at the Vienna General Hospital between the years 1841 and 1846.

    yearYears (1841-1846)
    birthsNumber of births
    deathsNumber of deaths
    clinicClinic 1 or clinic 2

    monthly_deaths.csv contains data from 'Clinic 1' of the hospital where most deaths occurred.

    dateDate (YYYY-MM-DD)
    birthsNumber of births
    deathsNumber of deaths
    # Imported libraries
    # Start coding here..
    # yearly and monthly
    yearly <- read_csv("data/yearly_deaths_by_clinic.csv")
    monthly <- read_csv("data/monthly_deaths.csv")
    # proportion_deaths
    yearly <- yearly %>%
      mutate(proportion_deaths = deaths / births)
    monthly <- monthly %>%
    	mutate(proportion_deaths = deaths / births)
    # ggplot line plots
    ggplot(yearly, aes(x = year, y = proportion_deaths, color = clinic)) + geom_line()
    ggplot(monthly, aes(x = date, y = proportion_deaths)) + geom_line()
    # add and plot handwashing_started to monthly
    monthly$handwashing_started <- monthly$date >= as.Date("1847-06-01")
    ggplot(monthly, aes(x = date, y = proportion_deaths, color = handwashing_started)) + geom_line()
    # mean proportion of deaths before and after handwashing
    monthly_summary <- monthly %>%
      group_by(handwashing_started) %>%
      summarize(mean_proportion_deaths = mean(proportion_deaths))