Graphics Reference
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able, smoke , is stored as a number, so we'll use the birthwt1 data set we created above, in which
smoke is a factor:
# Convert smoke to a factor
birthwt1$smoke <- factor(birthwt1$smoke)
# Map smoke to fill, make the bars NOT stacked, and make them semitransparent
ggplot(birthwt1, aes(x = bwt, fill = smoke)) +
geom_histogram(position = "identity" , alpha = 0.4 )
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