Comparing percentiles to ECDF
To see how the percentiles relate to the ECDF, you will plot the percentiles of Iris versicolor petal lengths you calculated in the last exercise on the ECDF plot you generated in chapter 1. The percentile variables from the previous exercise are available in the workspace as ptiles_vers and percentiles.
Note that to ensure the Y-axis of the ECDF plot remains between 0 and 1, you will need to rescale the percentiles array accordingly - in this case, dividing it by 100.
Toto cvičení je součástí kurzu
Statistical Thinking in Python (Part 1)
Pokyny k cvičení
- Plot the percentiles as red diamonds on the ECDF. Pass the x and y co-ordinates -
ptiles_versandpercentiles/100- as positional arguments and specify themarker='D',color='red'andlinestyle='none'keyword arguments. The argument for the y-axis -percentiles/100has been specified for you. - Display the plot.
Interaktivní cvičení na vyzkoušení si v praxi
Vyzkoušejte si toto cvičení dokončením tohoto ukázkového kódu.
# Plot the ECDF
_ = plt.plot(x_vers, y_vers, '.')
_ = plt.xlabel('petal length (cm)')
_ = plt.ylabel('ECDF')
# Overlay percentiles as red diamonds.
_ = plt.plot(____, percentiles/100, ____='D', ____='red',
____=____)
# Show the plot