[This article was first published on Data Analysis in R » Quick Guide for Statistics & R » finnstats, and kindly contributed to R-bloggers]. (You can report issue about the content on this page here)
Want to share your content on R-bloggers? click here if you have a blog, or here if you don't.

The post Conditional Mean in R with examples appeared first on finnstats.

Conditional Mean in R, to calculate a conditional mean in R, use the following syntax.

`mean(data[data\$Name == 'India', 'points'])`

For every row in the data frame where the ‘Name’ column equals ‘India,’ this calculates the mean of the ‘points’ column.

With the following data frame, the following examples demonstrate how to use this syntax in practice.

Let’s create a data frame

```data <- data.frame(Name=c('India', 'India', 'England', 'England', 'India', 'India'),
Score=c(360, 290, 293, 286, 288, 182),
points=c(8, 6, 7, 6, 7, 4))```

Now we can view the data frame

```data
Name Score points
1   India   360      8
2   India   290      6
3 England   293      7
4 England   286      6
5   India   288      7
6   India   182      4```

## Example 1: Calculate Conditional Mean for Categorical Variable

For every row in the data frame where the ‘Name’ column equals ‘India’ this calculates the mean of the ‘points’ column.

With the following data frame, the following examples demonstrate how to use this syntax in practice.

Animated Graph GIF with gganimate & ggplot » finnstats

```mean(data[data\$Name == 'India', 'points'])
1] 6.25```

The mean value in the ‘points’ column for the rows where ‘Name’ India is 6.25.

In the same way, you can calculate the ‘points’ score of the other ‘Name’.

## Example 2: Calculate Conditional Mean for Numeric Variable

The code below shows how to compute the mean of the ‘score’ column for only the rows in the data frame where the ‘points’ column is higher than or equal to 7.

Let’s calculate the mean of the ‘score’ column for rows where ‘points’ >= 7

```mean(data[data\$points >= 7, 'Score'])
[1] 313.6667```

The mean value in the ‘score’ column for the rows where ‘points’ is greater than or equal to 7 is 313.6667.

```mean(data[data\$points >= 5, 'Score'])
[1] 303.4```

The mean value in the ‘score’ column for the rows where ‘points’ is greater than or equal to 5 is 303.4

How to Perform Tukey HSD Test in R » Quick Guide » finnstats

To read more visit Conditional Mean in R with examples.

If you are interested to learn more about data science, you can find more articles here finnstats.

The post Conditional Mean in R with examples appeared first on finnstats.