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Cumulative Average in R, The average of a series of values up to a certain point is given by a cumulative average.

In R, you can calculate the cumulative average of values using the following methods.

Approach 1:- Base R

cum_avg <- cumsum(x) / seq_along(x)

Approach 2:- dplyr

library(dplyr)
cum_avg <- cummean(x)

Approach 3-: Using cumsum and seq_along

data$cum_avg_volume<-cumsum(data$Volume) / seq_along(data$Volume)  

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Above techniques get the same output, although the dplyr method is faster when working with huge data frames.

With the following data frame in R, the following examples explain how to utilize each method in practice.

Let’s create a data frame.

data <- data.frame(Month=seq(1:12),
                 Volume=c(3,5,7,8,4,9,1,2,9,12,14,15))

Now we can view the head of the data frame.

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head(data)
   Month Volume
1     1      3
2     2      5
3     3      7
4     4      8
5     5      4
6     6      9

Approach 1: Using Base R, calculate the Cumulative Average.

data$cum_avg_volume <- cumsum(data$Volume) / seq_along(data$Volume)

Okay, now view the updated data frame.

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data
   Month Volume cum_avg_volume
1      1      3       3.000000
2      2      5       4.000000
3      3      7       5.000000
4      4      8       5.750000
5      5      4       5.400000
6      6      9       6.000000
7      7      1       5.285714
8      8      2       4.875000
9      9      9       5.333333
10    10     12       6.000000
11    11     14       6.727273
12    12     15       7.416667

The cumulative average values could be interpreted as follows:

The first sales value’s cumulative average is 3.

The first two sales values have a cumulative average of 4.

The first three sales values have a cumulative average of 5.

And so forth.

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Example 2: Using dplyr, calculate the cumulative average

To calculate a cumulative average in R, we may use the cummean function from the dplyr package.

The following code demonstrates how to use this function to add a new column to our data frame that represents the volume cumulative average:

library(dplyr)

add a new column with the cumulative average of volume.

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data <- data.frame(Month=seq(1:12),
                   Volume=c(3,5,7,8,4,9,1,2,9,12,14,15))

Let’s view the updated data frame

data
  Month Volume cum_avg_volume
1      1      3       3.000000
2      2      5       4.000000
3      3      7       5.000000
4      4      8       5.750000
5      5      4       5.400000
6      6      9       6.000000
7      7      1       5.285714
8      8      2       4.875000
9      9      9       5.333333
10    10     12       6.000000
11    11     14       6.727273
12    12     15       7.416667

It’s worth noting that this strategy produces the same outcomes as the prior one.

Example 3: Using cumsum and seq_along

Using the cumsum and seq_along functions from the R programming language.

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data <- data.frame(Month=seq(1:12),
                   Volume=c(3,5,7,8,4,9,1,2,9,12,14,15))
data$cum_avg_volume<-cumsum(data$Volume) / seq_along(data$Volume)  
data
  Month Volume cum_avg_volume
1      1      3       3.000000
2      2      5       4.000000
3      3      7       5.000000
4      4      8       5.750000
5      5      4       5.400000
6      6      9       6.000000
7      7      1       5.285714
8      8      2       4.875000
9      9      9       5.333333
10    10     12       6.000000
11    11     14       6.727273
12    12     15       7.416667

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It’s worth noting that this technique yields the same results as we have seen in the one and two.

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