Difficulty with geom_dotplot

[Art]

Hello all,

I am having trouble getting separate dotplot columns to represent each variable in my variable column.  I just get three separate horizontal bands (no differentiation on the y axis).  Is there a problem with how my data are organized.  See dataframe dput and ggplot code.

Thanks for any help or advice.

Best,
Art

df dataframe...

structure(list(variable = structure(c(1L, 1L, 1L, 1L, 1L, 1L, 

                                      1L, 1L, 1L, 1L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 3L, 3L, 

                                      3L, 3L, 3L, 3L, 3L, 3L, 3L, 3L), .Label = c("center", "delay", 

                                      "no.barrier"), class = "factor"), value = c(3L, 4L, 3L, 7L, 4L, 

                                      3L, 8L, 14L, 4L, 3L, 29L, 35L, 30L, 28L, 21L, 21L, 35L, 29L, 

                                      33L, 35L, 8L, 9L, 10L, 15L, 21L, 36L, 27L, 27L, 11L, 14L)), .Names = c("variable", 

                                      "value"), row.names = c(NA, -30L), class = "data.frame")

ggplot(df, aes(x = factor(variable), y = "value")) +

  geom_dotplot(binaxis = "y", stackdir = "center")

[Dennis Murphy]

Hi:

Get rid of the quotes around value and you get the dotplot:

ggplot(df, aes(x = factor(variable), y = value)) +

geom_dotplot(binaxis = "y", stackdir = "center")

The clue is that the plot from your code returns a string constant
"value". Once you remove the quotes from value, it gets treated as a
numeric variable and the plot you expected is rendered.

Dennis

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[Art]

Dennis,

Thanks for the help!