Fixes

- throughput instead of troughput
- removed automatic calc of error
- better structured result summary

src/main/java/net/berack/upo/valpre/sim/stats/Result.java

@@ -54,7 +54,7 @@ public class Result {
                     fFormat.formatted(stats.avgQueueLength),
                     fFormat.formatted(stats.avgWaitTime),
                     fFormat.formatted(stats.avgResponse),
-                    fFormat.formatted(stats.troughput),
+                    fFormat.formatted(stats.throughput),
                     fFormat.formatted(stats.utilization * 100),
                     fFormat.formatted(stats.unavailable * 100),
                     fFormat.formatted(stats.lastEventTime));

src/main/java/net/berack/upo/valpre/sim/stats/ResultSummary.java

@@ -51,9 +51,16 @@ public class ResultSummary {
      * @param node the node to get the summary
      * @param stat the statistic to get the summary
      * @return the summary of the statistics of the node
+     * @throws IllegalArgumentException if the node or the statistic is not found
      */
     public StatisticsSummary getSummaryOf(String node, String stat) {
-        return this.stats.get(node).get(stat);
+        var stats = this.getSummaryOf(node);
+        var value = stats.get(stat);
+        if (value == null) {
+            var arr = String.join(", ", stats.keySet().toArray(new String[0]));
+            throw new IllegalArgumentException("Statistic [" + stat + "] not found. Available: " + arr);
+        }
+        return value;
     }
 
     /**
@@ -61,9 +68,13 @@ public class ResultSummary {
      * 
      * @param node the node to get the summary
      * @return the summary of the statistics of the node
+     * @throws IllegalArgumentException if the node is not found
      */
     public Map<String, StatisticsSummary> getSummaryOf(String node) {
-        return this.stats.get(node);
+        var stat = this.stats.get(node);
+        if (stat == null)
+            throw new IllegalArgumentException("Node not found");
+        return stat;
     }
 
     /**
@@ -99,7 +110,7 @@ public class ResultSummary {
                     fFormat.formatted(stats.get("avgQueueLength").average),
                     fFormat.formatted(stats.get("avgWaitTime").average),
                     fFormat.formatted(stats.get("avgResponse").average),
-                    fFormat.formatted(stats.get("troughput").average),
+                    fFormat.formatted(stats.get("throughput").average),
                     fFormat.formatted(stats.get("utilization").average * 100),
                     fFormat.formatted(stats.get("unavailable").average * 100),
                     fFormat.formatted(stats.get("lastEventTime").average));

src/main/java/net/berack/upo/valpre/sim/stats/Statistics.java

@@ -24,7 +24,7 @@ public class Statistics {
     // derived stats, you can calculate them even at the end
     public double avgWaitTime = 0.0d;
     public double avgResponse = 0.0d;
-    public double troughput = 0.0d;
+    public double throughput = 0.0d;
     public double utilization = 0.0d;
     public double unavailable = 0.0d;
 
@@ -75,7 +75,7 @@ public class Statistics {
         this.waitTime = this.responseTime - this.busyTime;
         this.avgWaitTime = this.waitTime / this.numDepartures;
         this.avgResponse = this.responseTime / this.numDepartures;
-        this.troughput = this.numDepartures / time;
+        this.throughput = this.numDepartures / time;
         this.utilization = this.busyTime / time;
         this.unavailable = this.unavailableTime / time;
 
@@ -120,7 +120,7 @@ public class Statistics {
      */
     public static String[] getOrderOfApply() {
         return new String[] { "numArrivals", "numDepartures", "avgQueueLength", "avgWaitTime", "avgResponse",
-                "busyTime", "waitTime", "unavailableTime", "responseTime", "lastEventTime", "troughput", "utilization",
+                "busyTime", "waitTime", "unavailableTime", "responseTime", "lastEventTime", "throughput", "utilization",
                 "unavailable" };
     }
 
@@ -152,7 +152,7 @@ public class Statistics {
         save.unavailableTime = func.apply(val1.unavailableTime, val2.unavailableTime);
         save.responseTime = func.apply(val1.responseTime, val2.responseTime);
         save.lastEventTime = func.apply(val1.lastEventTime, val2.lastEventTime);
-        save.troughput = func.apply(val1.troughput, val2.troughput);
+        save.throughput = func.apply(val1.throughput, val2.throughput);
         save.utilization = func.apply(val1.utilization, val2.utilization);
         save.unavailable = func.apply(val1.unavailable, val2.unavailable);
     }

src/main/java/net/berack/upo/valpre/sim/stats/StatisticsSummary.java

@@ -3,6 +3,7 @@ package net.berack.upo.valpre.sim.stats;
 import java.util.Arrays;
 import java.util.HashMap;
 import java.util.Map;
+import org.apache.commons.math3.distribution.TDistribution;
 
 /**
  * A summary of the values.
@@ -14,8 +15,8 @@ public class StatisticsSummary {
     public final double min;
     public final double max;
     public final double stdDev;
-    public final double error95;
     public final double[] values;
+    private final TDistribution distr;
 
     /**
      * Create a summary of the values.
@@ -41,7 +42,7 @@ public class StatisticsSummary {
         this.median = this.getPercentile(0.50);
         this.min = values[0];
         this.max = values[values.length - 1];
-        this.error95 = this.calcError(0.95);
+        this.distr = new TDistribution(null, values.length - 1);
     }
 
     /**
@@ -55,11 +56,8 @@ public class StatisticsSummary {
      * @return the error of the values
      */
     public double calcError(double alpha) {
-        var sampleSize = this.values.length;
-        var distr = new org.apache.commons.math3.distribution.TDistribution(sampleSize - 1);
-        var percentile = distr.inverseCumulativeProbability(alpha);
-
-        return percentile * (this.stdDev / Math.sqrt(sampleSize));
+        var percentile = this.distr.inverseCumulativeProbability(alpha);
+        return percentile * (this.stdDev / Math.sqrt(this.values.length));
     }
 
     /**