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AJ PHP Software Source Code Statistics Library
Median

number median ( number_array )

Description:

median returns the median of a set of numbers. If the number of elements in odd then the median is the middle number. If even, the median is the mean of the two middle number.

Source Code:

 function median (\$a) {   //variable and initializations   \$the_median = 0.0;   \$index_1 = 0;   \$index_2 = 0;   //sort the array   sort(\$a);   //count the number of elements   \$number_of_elements = count(\$a);   //determine if odd or even   \$odd = \$number_of_elements % 2;   //odd take the middle number   if (\$odd == 1)   {     //determine the middle     \$the_index_1 = \$number_of_elements / 2;     //cast to integer     settype(\$the_index_1, "integer");     //calculate the median     \$the_median = \$a[\$the_index_1];   }   else   {     //determine the two middle numbers     \$the_index_1 = \$number_of_elements / 2;     \$the_index_2 = \$the_index_1 - 1;     //calculate the median     \$the_median = (\$a[\$the_index_1] + \$a[\$the_index_2]) / 2;   }   return \$the_median; }

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_median = \$the_median
"; ?>

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

References - Books:

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