# Calculate the Truncated Mean

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## 0 Replies - 2135 Views - Last Post: 27 April 2012 - 08:22 AM

### #1 Ryano121

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# Calculate the Truncated Mean

Posted 27 April 2012 - 08:22 AM

Description: See Example Usage in snippetA truncated mean or trimmed mean is a statistical measure of central tendency, much like the mean and median. It involves the calculation of the mean after discarding given parts of a probability distribution or sample at the high and low end, and typically discarding an equal amount of both.
```import java.util.Arrays;

public class Means
{

/**
* Returns the truncated mean of a dataset
*
* @param data
*            The dataset to average
* @param truncPercentage
*            The percentage of values to ignore from the beginning and end of the dataset
* @return The truncated mean
*/
public static double truncatedMean(double[] data, double truncPercentage)
{
// get number of values to remove each side
int numRemove = (int) Math.floor(((truncPercentage / 100) * data.length) / 2);

// sort the data
double[] sortedData = data.clone();
Arrays.sort(sortedData);

double sum = 0;
int count = 0;

// sum the values and get a count of the data, not taking into account numRemove values from the start and end
for (int i = numRemove; i < (sortedData.length - numRemove); i++)
{
sum += sortedData[i];
count++;
}

return sum / count;
}

public static void main(String[] args)
{
double[] x = { 2, 3, 4, 5, 6, 8, 10, 11.53542 };

System.out.println("95% truncated mean = " + Means.truncatedMean(x, 95));
}
}

// OUTPUT

// 95% truncated mean = 5.5
```

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