I am try to do a simple ggplot of my dataframe

```
structure(list(CLevel = c(3, 4, 5, 6, 7, 8, 9, 10, 11),
Sensitivity = structure(c(1L, 2L, 3L, 3L, 5L, 5L, 7L, 8L, 9L),
.Label = c("56.6666666666667","53.125", "52.9411764705882", "52.9411764705882",
"54.2857142857143", "54.2857142857143", "55.5555555555556", "56.7567567567568",
"57.1428571428571"), class = "factor"),
Specificity = c(76.4705882352941, 76.4705882352941, 76.4705882352941, 76.4705882352941,
76.4705882352941, 76.4705882352941, 76.4705882352941,
76.4705882352941, 76.4705882352941)),
.Names = c("CLevel", "Sensitivity", "Specificity"), row.names = c(NA, -9L),
class ="data.frame")
```

When I do the plot as follows

```
library(ggplot2)
ggplot() +
geom_point(aes(CLevel, Sensitivity, color = "red",size=12), St) +
geom_point(shape=5)
```

I get an x axis which is not ordered the way I want.

So than I tried

```
St$Sensitivity <- factor(St$Sensitivity, levels = St$Sensitivity[order(St$CLevel)])
```

but I get the error

```
In `levels<-`(`*tmp*`, value = if (nl == nL) as.character(labels) else paste0(labels, : duplicated levels in factors are deprecated
```

So I looked at my data frame again and it looks as though there are duplicates in the Sensitivity column because the decimal point has been stripped off so some of the numbers are exactly the same. All I want to do is order the x axis so this seems unnecessarily complicated. How can I do this?

Answer:

If you change Sensitivity to a double, the resulting plot looks appropriate:

```
St <- structure(list(CLevel = c(3, 4, 5, 6, 7, 8, 9, 10, 11),
Sensitivity = c(56.6666666666667, 53.125, 52.9411764705882,
52.9411764705882, 54.2857142857143, 54.2857142857143,
55.5555555555556, 56.7567567567568, 57.1428571428571 ),
Specificity = c(76.4705882352941, 76.4705882352941,
76.4705882352941, 76.4705882352941, 76.4705882352941,
76.4705882352941, 76.4705882352941, 76.4705882352941,
76.4705882352941)),
.Names = c("CLevel", "Sensitivity", "Specificity"),
row.names = c(NA, -9L), class = "data.frame")
library(ggplot2)
ggplot() +
geom_point(aes(CLevel, Sensitivity, color = "red",size=12), St) +
geom_point(shape=5)
```

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