code: package edu.cmu.tetrad.algcomparison.statistic;
  
  import edu.cmu.tetrad.graph.Graph;
  
  /**
   * Records the elapsed time of the algorithm in seconds. This is a placeholder, really;
   * the elapsed time is calculated by the comparison class and recorded if this statistic is
   * used.
   *
   * @author jdramsey
   */
  public class ElapsedTime implements Statistic {
      static final long serialVersionUID = 23L;
  
      @Override
      public String getAbbreviation() {
          return "E";
      }
  
      @Override
      public String getDescription() {
          return "Elapsed Time in Seconds";
      }
  
      @Override
      public double getValue(Graph trueGraph, Graph estGraph) {
          return Double.NaN; // This has to be handled separately.
      }
  
      @Override
      public double getNormValue(double value) {
          return 1 - Math.tanh(0.001 * value);
      }
  }
  