Thread for students in Kane's Data Science Bootcamp to post example questions

Do not answer the questions in this thread!

The purpose of this thread to provide a location for students in my classes to post example questions. They do so in the process of working on my tutorials.

library(tidyverse)
head(mtcars)
#> mpg cyl disp hp drat wt qsec vs am gear carb
#> Mazda RX4 21.0 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 22.8 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 18.1 6 225 105 2.76 3.460 20.22 1 0 3 1
ggplot(data = mtcars,
mapping = aes(x = cyl,
y = mpga)) +
geom_col()
#> Error in FUN(X[[i]], ...): object 'mpga' not found

I can't figure out this error.

I can't figure out this error

library(tidyverse)
head(mtcars)
#>                    mpg cyl disp  hp drat    wt  qsec vs am gear carb
#> Mazda RX4         21.0   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        22.8   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           18.1   6  225 105 2.76 3.460 20.22  1  0    3    1
ggplot(data = mtcars, mapping = aes(x = cyl, y = mpga)) + 
  geom_col()
#> Error in FUN(X[[i]], ...): object 'mpga' not found

Created on 2022-06-18 by the reprex package (v2.0.1)

library(tidyverse)
library(primer.data)
ggplot(data = qscores, mapping = aes(x = rating)) +
geom_histogram(color = "white", bins = 30) +
labs(title = "Histogram of Student Ratings of Harvard Classes",
subtitle = "Ratings of 1 and 2 are very rare",
x = "Rating", y = "Count", caption = "Source: Harvard Q-Guide (2018 - 2019)")


![](https://i.imgur.com/nSxMvsf.png)

<sup>Created on 2022-06-20 by the [reprex package](https://reprex.tidyverse.org) (v2.0.1)</sup>

I can't figure out this error

reprex({
library(tidyverse)
library(reprex)
head(mtcars)
ggplot(data=mtcars,
       mapping=aes(
         x = cyl,
         y= mpga)) + 
  geom_col()})
#> Error in reprex({: could not find function "reprex"

Created on 2022-06-20 by the reprex package (v2.0.1)

I can't figure out this error

library(tidyverse)
head(mtcars)
#>                    mpg cyl disp  hp drat    wt  qsec vs am gear carb
#> Mazda RX4         21.0   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        22.8   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           18.1   6  225 105 2.76 3.460 20.22  1  0    3    1
+ggplot(data = mtcars, 
       aes(x = cyla, y = mpg))+
  geom_col()
#> Error:
#> ! Cannot use `+.gg()` with a single argument. Did you accidentally put + on a new line?

Created on 2022-06-20 by the reprex package (v2.0.1)

Error

library(tidyverse)
head(mtcars)
#>                    mpg cyl disp  hp drat    wt  qsec vs am gear carb
#> Mazda RX4         21.0   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        22.8   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           18.1   6  225 105 2.76 3.460 20.22  1  0    3    1

ggplot(data = mtcars,
       mapping = aes(x = cyl,
                     y = mpga)) +
  geom_col()
#> Error in FUN(X[[i]], ...): object 'mpga' not found

Created on 2022-06-20 by the reprex package (v2.0.1)

I cant figure out this error

reprex({library(tidyverse)
head(mtcars)
ggplot(data= mtcars, mapping= aes(x= cyl, y= mpga))+
  geom_col()})
#> Error in reprex({: could not find function "reprex"

Created on 2022-06-20 by the reprex package (v2.0.1)

library(tidyverse)
head(mtcars)
#> mpg cyl disp hp drat wt qsec vs am gear carb
#> Mazda RX4 21.0 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 22.8 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 18.1 6 225 105 2.76 3.460 20.22 1 0 3 1

ggplot(data = mtcars,
mapping = aes(x = cyl,
y = mpga)) +
geom_col()
#> Error in FUN(X[[i]], ...): object 'mpga' not found

I can't figure out this error.

library(tidyverse)
head(mtcars)
#> mpg cyl disp hp drat wt qsec vs am gear carb
#> Mazda RX4 21.0 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 22.8 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 18.1 6 225 105 2.76 3.460 20.22 1 0 3 1
ggplot(data=mtcars,aes(x=cyl,y=mpga))+geom_col()
#> Error in FUN(X[[i]], ...): object 'mpga' not found

I can't figure out this error.

y=mpga is a typo; there is no a

library(tidyverse)
head(mtcars)
#>                    mpg cyl disp  hp drat    wt  qsec vs am gear carb
#> Mazda RX4         21.0   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        22.8   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           18.1   6  225 105 2.76 3.460 20.22  1  0    3    1

ggplot(data = mtcars,
       mapping = aes(x = cyl,
                     y = mpga)) +
  geom_col()
#> Error in FUN(X[[i]], ...): object 'mpga' not found

I can't figure out this code