--- /dev/null
+/*
+ * 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();
+
+ //this is a modification do to a vector fill error that occurs when an empty sharedRabund creates a sabund
+ //in that case there is no 1 0r 2.
+ double singles;
+ if (rank->size() > 1) {
+ singles = (double)rank->get(1);
+ }else{ singles = 0.0; }
+
+ double doubles;
+ if (rank->size() > 2) {
+ doubles = (double)rank->get(2);
+ }else{ doubles = 0.0; }
+
+ double chaovar = 0.0000;
+//cout << "singles = " << singles << " doubles = " << doubles << " sobs = " << sobs << endl;
+ double chao = sobs + singles*(singles-1)/(2*(doubles+1));
+
+ if(singles > 0 && doubles > 0){
+ chaovar = singles*(singles-1)/(2*(doubles+1))
+ + singles*pow(2*singles-1, 2)/(4*pow(doubles+1,2))
+ + pow(singles, 2)*doubles*pow(singles-1, 2)/(4*pow(doubles+1,4));
+ }
+ else if(singles > 0 && doubles == 0){
+ chaovar = singles*(singles-1)/2 + singles*pow(2*singles-1, 2)/4 - pow(singles, 4)/(4*chao);
+ }
+ else if(singles == 0){
+ chaovar = sobs*exp(-1*rank->getNumSeqs()/sobs)*(1-exp(-1*rank->getNumSeqs()/sobs));
+ }
+
+ double chaohci, chaolci;
+
+ if(singles>0){
+ 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
+ }
+ else{
+ double p = exp(-1*rank->getNumSeqs()/sobs);
+ chaolci = sobs/(1-p)-1.96*pow(sobs*p/(1-p), 0.5);
+ chaohci = sobs/(1-p)+1.96*pow(sobs*p/(1-p), 0.5);
+ if(chaolci < sobs){ chaolci = sobs; }
+ }
+
+ 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) {
+ m->errorOut(e, "Chao1", "getValues");
+ exit(1);
+ }
+}
+
+/***********************************************************************/