diff --git a/src/main/java/Simulator.java b/src/main/java/Simulator.java
index f74312e..a1b2609 100644
--- a/src/main/java/Simulator.java
+++ b/src/main/java/Simulator.java
@@ -245,11 +245,11 @@ public class Simulator implements GraphModificationFunctions {
         //rate of pairing error
         double pairingErrorRate = (double) falseCount / (trueCount + falseCount);
         BigDecimal pairingErrorRateTrunc;
-        if(!Double.isFinite(pairingErrorRate)) {
-            pairingErrorRateTrunc = new BigDecimal(-1, mc);
+        if(Double.isFinite(pairingErrorRate)) {
+            pairingErrorRateTrunc = new BigDecimal(pairingErrorRate, mc);
         }
         else{
-            pairingErrorRateTrunc = new BigDecimal(pairingErrorRate, mc);
+            pairingErrorRateTrunc = new BigDecimal(-1, mc);
         }
         //get list of well populations
         Integer[] wellPopulations = data.getWellPopulations();