How to Calculate Ratios in R? The following two techniques can be used in R to determine the ratio of values in two columns.
The following data frame, which displays the total number of shots taken and attempted by different basketball players, is used to demonstrate how each strategy should be used in practice.
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How to Calculate Ratios in R
Let’s create a data frame
df <- data.frame(players=c('A', 'B', 'C', 'D', 'E', 'F', 'G', 'H'),
makes=c(14, 11, 10, 12, 15, 11, 5, 8),
attempts=c(20, 17, 11, 13, 20, 12, 15, 19))
Now we can view the data frame
df
players makes attempts 1 A 14 20 2 B 11 17 3 C 10 11 4 D 12 13 5 E 15 20 6 F 11 12 7 G 5 15 8 H 8 19
Example 1: Calculate Ratios Using Base R
The ratio between the values in the makes and attempts columns can be calculated using base R by running the following code:
df$ratio <- df$makes/df$attempts df
players makes attempts ratio 1 A 14 20 0.7000000 2 B 11 17 0.6470588 3 C 10 11 0.9090909 4 D 12 13 0.9230769 5 E 15 20 0.7500000 6 F 11 12 0.9166667 7 G 5 15 0.3333333 8 H 8 19 0.4210526
Additionally, we can round the ratio values to a specified number of decimal places using the round() function.
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df$ratio <- round(df$makes/df$attempts, 2) df
players makes attempts ratio 1 A 14 20 0.70 2 B 11 17 0.65 3 C 10 11 0.91 4 D 12 13 0.92 5 E 15 20 0.75 6 F 11 12 0.92 7 G 5 15 0.33 8 H 8 19 0.42
Player D and F shows highest ratio.
Example 2: Calculate Ratios Using dplyr
Using the dplyr package, the following code illustrates how to determine the ratio between the values in the makes and attempts columns:
library(dplyr)
df <- df %>%
mutate(ratio = makes/attempts)
df
players makes attempts ratio 1 A 14 20 0.7000000 2 B 11 17 0.6470588 3 C 10 11 0.9090909 4 D 12 13 0.9230769 5 E 15 20 0.7500000 6 F 11 12 0.9166667 7 G 5 15 0.3333333 8 H 8 19 0.4210526
Additionally, we can round the ratio values to a specified number of decimal places using the round() function.
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df <- df %>%
mutate(ratio = round(makes/attempts, 2))
df
players makes attempts ratio 1 A 14 20 0.70 2 B 11 17 0.65 3 C 10 11 0.91 4 D 12 13 0.92 5 E 15 20 0.75 6 F 11 12 0.92 7 G 5 15 0.33 8 H 8 19 0.42
The ratio column’s values have all been rounded to two decimal places at this point.
Note that the outcomes of the dplyr method and the base R method are identical.
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