OpenMRS

Timestamp:

08/08/08 09:27:27 (5 months ago)

Author:

jegg

Message:

in patientmatching module, updated EM analysis to set the score threshold of a match along with m and u values

Files:

• openmrs-modules/patientmatching/src/org/regenstrief/linkage/analysis/EMAnalyzer.java (modified) (2 diffs)

openmrs-modules/patientmatching/src/org/regenstrief/linkage/analysis/EMAnalyzer.java

@@ -4 +4 @@
-import java.util.Hashtable;
-import java.util.Iterator;
+import java.util.List;
-
-import org.apache.log4j.Logger;
@@ -268 +269 @@
-                //***************************************
-                
+                log.info("previous score threshold:\t" + mc.getScoreThreshold());
+                // change the score threshold to one calculated from estimated true matches
+                VectorTable vt = new VectorTable(mc);
+                
+                // get sorted list of results
+                List<MatchResult> results = vt.getPossibleMatchResults();
+                Iterator<MatchResult> it = results.iterator();
+                double total = 0;
+                MatchResult total_mr = null;
+                double prev_total = 0;
+                MatchResult prev_mr = null;
+                while(it.hasNext() && total < true_matches){
+                        MatchResult mr = it.next();
+                        double d = mr.getTrueProbability() * total_pairs;
+                        prev_total = total;
+                        prev_mr = total_mr;
+                        total += d;
+                        total_mr = mr;
+                }
+                // choose total or prev_total, depending on which one is closer to estimated matches
+                if(Math.abs(total - true_matches) > Math.abs(prev_total - true_matches)){
+                        // use previous score as threshold
+                        mc.setScoreThreshold(prev_mr.getScore());
+                } else {
+                        mc.setScoreThreshold(total_mr.getScore());
+                }
+                log.info("new score threshold:\t" + mc.getScoreThreshold());
+                
-                for(int i = 0; i < demographics.length; i++){
-                        String demographic = demographics[i];