def plot_histograms(self):
dataframe = merge_by_year(self.year)
dataframe = dataframe.dropna()
plt.figure()
dataframe.hist('Income', by = 'Region', xlabelsize = 7, ylabelsize = 10, bins = 30)
plt.xlabel('Income per Person')
plt.ylabel('Number of Countries')
plt.savefig('histograms_by_region_in_{}.png'.format(self.year))
plt.close()
def plot_boxplots(self):
dataframe = merge_by_year(self.year)
dataframe = dataframe.dropna()
plt.figure()
dataframe.boxplot('Income', by = 'Region')
plt.xlabel('Region')
plt.ylabel('Income per Person')
plt.title('Income per Person by Region in year {}'.format(self.year))
plt.savefig('boxplot_by_region_in_{}.png'.format(self.year))
plt.close()