New Variables ..sumprop.., ..sumpct.. in the bin Statistic

import pandas as pd

from lets_plot import *

LetsPlot.setup_html()

df = pd.read_csv("https://raw.githubusercontent.com/JetBrains/lets-plot-docs/master/data/mpg.csv")
print(df.shape)
df.head()

(234, 12)

	Unnamed: 0	manufacturer	model	displ	year	cyl	trans	drv	cty	hwy	fl	class
0	1	audi	a4	1.8	1999	4	auto(l5)	f	18	29	p	compact
1	2	audi	a4	1.8	1999	4	manual(m5)	f	21	29	p	compact
2	3	audi	a4	2.0	2008	4	manual(m6)	f	20	31	p	compact
3	4	audi	a4	2.0	2008	4	auto(av)	f	21	30	p	compact
4	5	audi	a4	2.8	1999	6	auto(l5)	f	16	26	p	compact

g = ggplot(df, aes(x="cty")) + facet_grid(x="cyl")

# Default plot
g + geom_histogram(binwidth=5, center=5)

# When y='..sumprop..', sum of values in each group is equal to 1
g + geom_histogram(aes(y='..sumprop..'), binwidth=5, center=5)

# When y='..sumpct..', sum of values in each group is equal to 100
g + geom_histogram(aes(y='..sumpct..'), binwidth=5, center=5)