Eliminate Missing Values Before Drawing ggplot2 Plot in R (2 Examples)

This article illustrates how to eliminate NA values from a ggplot2 graphic in R.

Preparing the Examples

data(mtcars)                                                        # Loading mtcars data
mtcars$mpg[c(1, 3, 6, 10, 15)] <- NA                                # Adding NA values to data 
head(mtcars)                                                        # Head of example data
#                    mpg cyl disp  hp drat    wt  qsec vs am gear carb
# Mazda RX4           NA   6  160 110 3.90 2.620 16.46  0  1    4    4
# Mazda RX4 Wag     21.0   6  160 110 3.90 2.875 17.02  0  1    4    4
# Datsun 710          NA   4  108  93 3.85 2.320 18.61  1  1    4    1
# Hornet 4 Drive    21.4   6  258 110 3.08 3.215 19.44  1  0    3    1
# Hornet Sportabout 18.7   8  360 175 3.15 3.440 17.02  0  0    3    2
# Valiant             NA   6  225 105 2.76 3.460 20.22  1  0    3    1
install.packages("ggplot2")                                         # Install & load ggplot2
library("ggplot2")

Example 1: Draw ggplot2 Plot Based on Data Frame with Missing Values

ggplot(mtcars,                                                      # Create ggplot2 graph with NA data (warning message)
       aes(mpg, disp)) +
  geom_point()
# Warning message:
#   Removed 3 rows containing missing values (geom_point).

r graph figure 1 eliminate missing values before drawing ggplot2 r

Example 2: Remove NA Values Before Drawing ggplot2 Plot

mtcars_cc <- mtcars[complete.cases(mtcars[ , c("mpg", "disp")]), ]  # Delete rows with NA
head(mtcars_cc)                                                     # Show complete data in RStudio console
#                    mpg cyl  disp  hp drat    wt  qsec vs am gear carb
# Mazda RX4 Wag     21.0   6 160.0 110 3.90 2.875 17.02  0  1    4    4
# Hornet 4 Drive    21.4   6 258.0 110 3.08 3.215 19.44  1  0    3    1
# Hornet Sportabout 18.7   8 360.0 175 3.15 3.440 17.02  0  0    3    2
# Duster 360        14.3   8 360.0 245 3.21 3.570 15.84  0  0    3    4
# Merc 240D         24.4   4 146.7  62 3.69 3.190 20.00  1  0    4    2
# Merc 230          22.8   4 140.8  95 3.92 3.150 22.90  1  0    4    2
ggplot(mtcars_cc,                                                   # Create ggplot2 graph with complete data
       aes(mpg, disp)) +
  geom_point()

r graph figure 2 eliminate missing values before drawing ggplot2 r

Figure 2 is exactly the same as Figure 1. However, this time the RStudio console didn’t return a warning message after executing the ggplot2 functions.

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