## Calculates 1 variable statistics

Submitted by:Jhon Jhon

Category:C++

C++ code example to calculate 1 variable statistics

Tags: variable , calculate , statistics

Code Snippet:

``#include <iostream.h>#include <math.h> double x_avg(double *x, int n);  // Calculates Average of x arraydouble sum_x(double *x, int n); // Calculates sum of x arraydouble sum_x_squared(double *x, int n);  // Calculates the sum of the squares of each elementdouble sample(double *x, int n);  // Calculates sample stanard deviationdouble stan_dev(double *x, int n);  // Calculates standard deviationint number(int n);  // Returns array sizedouble xmin(double *x, int n);  // Returns smallest x valuedouble xmax(double *x, int n);  // Returns largest x value int main(){  unsigned int n;   cout << "Enter amount of x value:";  cin >> n;   double x[n];   for (int i = 0; i < n; i++)  {    cout << "Enter value for x[" << i << "]:";    cin >> x[i];  }   cout << "Mean of x[i]:\t\t\t" << x_avg(x, n) << endl;  cout << "Sum of x[i]:\t\t\t" << sum_x(x, n) << endl;  cout << "Sum of x[i] squared:\t\t" << sum_x_squared(x, n) << endl;  cout << "Sample Standard Deviation:\t" << sample(x, n) << endl;  cout << "Standard Deviation:\t\t" << stan_dev(x, n) << endl;  cout << "Number of x values:\t\t" << number(n) << endl;  cout << "Minimum value of x:\t\t" << xmin(x, n) << endl;  cout << "Maximum value of x:\t\t" << xmax(x, n) << endl;   return 0;} double x_avg(double x[], int n){  return (sum_x(x, n)/n);} double sum_x(double x[], int n){  double sum;   for (int i = 0; i < n; i++)  {    sum += x[i];  }   return sum;} double sum_x_squared(double x[], int n){  double sum_x_2;   for (int i = 0; i < n; i++)  {    sum_x_2 += pow(x[i], 2);  }   return sum_x_2;} double sample(double x[], int n){  double sample_stan_dev, sum_xi_x_2;   for (int i = 0; i < n; i++)  {    sum_xi_x_2 += pow(x[i] - x_avg(x, n), 2);  }   sample_stan_dev = sqrt(1/((double)n-1) * sum_xi_x_2);   return sample_stan_dev;} double stan_dev(double x[], int n){  double stan_deviation, sum_xi_x_2;   for (int i = 0; i < n; i++)  {    sum_xi_x_2 += pow(x[i] - x_avg(x, n), 2);  }   stan_deviation = sqrt(sum_xi_x_2 / n);   return stan_deviation;} int number(int n){  return n;} double xmin(double x[], int n){  double minx = x[0];   for (int i = 0; i < n; i++)  {    if (x[i] < minx)      minx = x[i];  }   return minx;} double xmax(double x[], int n){  double maxx = x[0];   for (int i = 0; i < n; i++)  {    if (x[i] > maxx)      maxx = x[i];  }   return maxx;}``