search for: perf1

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2014 Jun 20
2
Como construir una curva ROC
...os manuales el script del ROCR para hacer la curva era algo asi: library(ROCR) data(ROCR.simple) pred <- prediction( ROCR.simple$predictions, ROCR.simple$labels) perf <- performance(pred,"tpr","fpr") plot(perf) ## precision/recall curve (x-axis: recall, y-axis: precision) perf1 <- performance(pred, "prec", "rec") plot(perf1) ## sensitivity/specificity curve (x-axis: specificity, ## y-axis: sensitivity) perf1 <- performance(pred, "sens", "spec") plot(perf1) Me parecio mas fácil de entender que el del otro paquete pero no se co...
2009 May 12
1
ROCR: auc and logarithm plot
...I have two questions regarding ROCR. 1. I have tried to understand how to extract area-under-curve value by looking at the ROCR document and googling. Still I am not sure if I am doing the right thing. Here is my code, is "auc1" the auc value? " pred1 <- prediction(resp1,label1) perf1 <- performance(pred1,"tpr","fpr") plot( perf1, type="l",col=1 ) auc1 <- performance(pred1,"auc") auc1 <- auc1@y.values[[2]] " 2. I have to compare two models that have very close ROCs. I'd like to have a more distinguishable plot of the RO...
2014 Jun 23
2
Resumen de R-help-es, Vol 64, Envío 33
...os manuales el script del ROCR para hacer la curva era algo asi: library(ROCR) data(ROCR.simple) pred <- prediction( ROCR.simple$predictions, ROCR.simple$labels) perf <- performance(pred,"tpr","fpr") plot(perf) ## precision/recall curve (x-axis: recall, y-axis: precision) perf1 <- performance(pred, "prec", "rec") plot(perf1) ## sensitivity/specificity curve (x-axis: specificity, ## y-axis: sensitivity) perf1 <- performance(pred, "sens", "spec") plot(perf1) Me parecio mas fácil de entender que el del otro paquete pero no se co...