How to Compute the Cumulative Average in R (Example Code)

This page explains how to calculate the cumulative mean of a data frame column in R.

Introduction of Exemplifying Data

data(iris)                                   # Load iris data
head(iris)
#   Sepal.Length Sepal.Width Petal.Length Petal.Width Species
# 1          5.1         3.5          1.4         0.2  setosa
# 2          4.9         3.0          1.4         0.2  setosa
# 3          4.7         3.2          1.3         0.2  setosa
# 4          4.6         3.1          1.5         0.2  setosa
# 5          5.0         3.6          1.4         0.2  setosa
# 6          5.4         3.9          1.7         0.4  setosa

Example: Computing Cumulative Mean of Data Frame Column

cummean_SL <- cumsum(iris$Sepal.Length) /    # Calculate cumulative mean of column
  seq_along(iris$Sepal.Length)
head(cummean_SL)                             # Print head of result
# [1] 5.100 5.000 4.900 4.825 4.860 4.950

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