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AJ PHP Software Source Code Statistics Library
Variance of a Population

number variance_population ( number_array )

Description:

variance_population returns the variance given the entire population.

Source Code:

 function variance_population (\$a) {   //variable and initializations   \$the_variance = 0.0;   \$the_mean = 0.0;   \$the_array_sum = array_sum(\$a); //sum the elements   \$number_elements = count(\$a); //count the number of elements   //calculate the mean   \$the_mean = \$the_array_sum / \$number_elements;   //calculate the variance   for (\$i = 0; \$i < \$number_elements; \$i++)   {     //sum the array     \$the_variance = \$the_variance + (\$a[\$i] - \$the_mean) * (\$a[\$i] - \$the_mean);   }   \$the_variance = \$the_variance / \$number_elements;   //return the variance   return \$the_variance; }

Example:

 "; echo "a[1] = \$a[1]
"; echo "a[2] = \$a[2]
"; echo "a[3] = \$a[3]
"; echo "a[4] = \$a[4]
"; echo "a[5] = \$a[5]
"; echo "the_variance = \$the_variance
"; ?>

Run Example

 binomial coefficient binomial coefficient mean mean of a set of number median median of a set of number standard deviation population standard deviation of a population standard deviation sample standard deviation of a sample variance population variance of a population variance sample variance of a sample

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