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diff --git a/chao1.cpp b/chao1.cpp
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+++ b/chao1.cpp
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+/*
+ *  chao1.cpp
+ *  Dotur
+ *
+ *  Created by Sarah Westcott on 1/7/09.
+ *  Copyright 2009 Schloss Lab UMASS Amherst. All rights reserved.
+ *
+ */
+
+#include "chao1.h"
+
+/***********************************************************************/
+EstOutput Chao1::getValues(SAbundVector* rank){
+	try {
+		data.resize(3,0);
+	
+		double sobs = (double)rank->getNumBins();
+	
+		double singles = (double)rank->get(1);
+		double doubles = (double)rank->get(2);
+		double chaovar = 0.0000;
+	
+		double chao = sobs + pow(singles,2)/(2*(doubles+1)) - (singles*doubles/(2*pow(doubles+1,2)));
+	
+		if(doubles==0){chaovar=0;}
+		else{
+			double g=singles/doubles;
+			chaovar = doubles*(0.25*pow(g,4)+pow(g,3)+0.5*pow(g,2));
+		}
+
+	
+		double chaohci, chaolci;
+	
+		if(chao==sobs){
+			double ci = 1.96*pow(chaovar,0.5);
+			chaolci = chao-ci;//chao lci
+			chaohci = chao+ci;//chao hci
+		}
+		else{
+			double denom = pow(chao-sobs,2);
+			double c = exp(1.96*pow((log(1+chaovar/denom)),0.5));
+			chaolci = sobs+(chao-sobs)/c;//chao lci
+			chaohci = sobs+(chao-sobs)*c;//chao hci
+		}
+		
+		data[0] = chao;
+		data[1] = chaolci;
+		data[2] = chaohci;
+
+	    if (isnan(data[0]) || isinf(data[0])) { data[0] = 0; }
+		if (isnan(data[1]) || isinf(data[1])) { data[1] = 0; }
+		if (isnan(data[2]) || isinf(data[2])) { data[2] = 0; }
+		
+		return data;
+	}
+	catch(exception& e) {
+		cout << "Standard Error: " << e.what() << " has occurred in the Chao1 class Function getValues. Please contact Pat Schloss at pschloss@microbio.umass.edu." << "\n";
+		exit(1);
+	}
+	catch(...) {
+		cout << "An unknown error has occurred in the Chao1 class function getValues. Please contact Pat Schloss at pschloss@microbio.umass.edu." << "\n";
+		exit(1);
+	}	
+};
+
+/***********************************************************************/