R Mean Median and Mode

📊 R Mean, Median, and Mode

They help you understand the center or typical value of a dataset.

 Sample Data

 1. Mean (Average)

The mean is the sum of all values divided by the number of values.

Formula:

Mean=Sum of valuesNumber of values\text{Mean} = \frac{\text{Sum of values}}{\text{Number of values}}Mean=Number of valuesSum of values​

Mean with missing values (NA)

 2. Median (Middle Value)

The median is the middle value when data is sorted.

📌

• If count is odd → middle value

• If count is even → average of two middle values

 3. Mode (Most Frequent Value)

R does not have a built-in mode function, but we can create one.

Custom Mode Function

✔ Returns the most frequent value

 4. Mean, Median, Mode Together

 5. Mean & Median in Data Frames

 6. When to Use What?

 7. Effect of Outliers

📌 Mean affected by outliers, median is not.

📌 Summary

• Mean → average value

• Median → middle value

• Mode → most frequent value

• Use na.rm = TRUE to ignore missing data

• Median is best when data has outliers