text: #ifndef METRICS_H_
  #define METRICS_H_
  #include <algorithm>  // generate
  #include <vector>     // vector
  #include <iterator>   // begin, end, and ostream_iterator
  #include <iostream>   // cout
  #include <iomanip>
  #include <map>
  #include <utility>
  #include <set>
  #include <stdlib.h>
  #include <cstdlib>
  #include <string>
  #include <numeric>
  #include <sstream>
  
  using namespace std;
  
  
  map<int, double> concordance_index(vector<double> risk, vector<double> T, 
  								   vector<double> E, bool include_ties);
  
  map<int, vector<double> > brier_score(vector<vector<double> > Survival,
  								  	 vector<double> T, vector<double> E, 
  								  	 double t_max, vector<double> times, 
  								     vector<pair<double,double> > time_buckets,
  								     bool use_mean_point);
  
  map<int, vector<double> > time_ROC(vector<double> risk, vector<double> T,
  								   vector<double> E, double t);
  
  #endif /* METRICS_H_*/