R ggplot2: stat_count() must not be used with a y aesthetic error in Bar graph

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First off, your code is a bit off. aes() is an argument in ggplot(), you don’t use ggplot(...) + aes(...) + layers

Second, from the help file ?geom_bar:

By default, geom_bar uses stat=”count” which makes the height of the
bar proportion to the number of cases in each group (or if the weight
aethetic is supplied, the sum of the weights). If you want the heights
of the bars to represent values in the data, use stat=”identity” and
map a variable to the y aesthetic.

You want the second case, where the height of the bar is equal to the conversion_rate So what you want is…

data_country <- data.frame(country = c("China", "Germany", "UK", "US"), 
            conversion_rate = c(0.001331558,0.062428188, 0.052612025, 0.037800687))
ggplot(data_country, aes(x=country,y = conversion_rate)) +geom_bar(stat = "identity")

Result:

enter image description here

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