Using `geom_line()` with X axis being factors

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If I understand the issue correctly, specifying group=1 and adding a stat_summary() layer should do the trick:

ggplot(hist, aes(x=weekday, y=counts, group=1)) +
geom_point(stat="summary", fun.y=sum) +
stat_summary(fun.y=sum, geom="line")

enter image description here

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