Questions tagged [rocr]

An R package for performance evaluation by visualizing the performance of scoring classifiers.

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1answer
280 views

Is ROCR applied to training data or testing data?

Is ROCR applied to training data or testing data? Why? Thank you,
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0answers
26 views

Text retrieval from an image is not appropriate

I have an image where it contains names of several resources. When I am trying to read the text from the image using R its not throwing how it is present in image. For instance J is reported as I Or ...
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0answers
263 views

In R's ROCR package, is it an error for cutoffs to be infinity?

In R, there is an ROC package called ROCR. In their default simple example, they have: ...
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0answers
389 views

ROCR Prediction/Perfromance

I am having problem with the understanding of ROCR package , following are my questions please clarify my concept 1)What prediction and performance function does in ROCR? 2)If a model has overall ...
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1answer
3k views

Specify cutoffs in ROCR (R package)

I'm using the ROCR package in R to measure performance. The data I have has thousands of data points (700,000). ROCR ends up picking too many cutoff values and I end up with a performance object which ...
3
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1answer
240 views

Work flow for multinomial text extraction of OCR data

I am interested in recreating (for cost and data sharing discrepancies) a solution that machine learning solution companies like ABBYY have done. I would like to be able to take purchase order PDFs ...
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1answer
719 views

SVM Classifier Evaluation in R

I am working on an application to evaluate the performance of SVM on a number of different datasets. SVM is working well, yielding 98% diagonal accuracy. I now need to evaluate the performance of ...
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1answer
7k views

R - Lift chart analysis & classification tree - ROCR

I am trying to compare several models of classification tree using the ROCR package however, the x-axis in this package ...
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1answer
6k views

Area under ROC curve for random forest

Does the area under ROC curve depends on which class is defined as default positive class by the random forest model? I am using ...
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2answers
14k views

ROC for more than 2 outcome categories

How do you construct ROC Curves when there are more than two outcome categories (in my case, I have four)? I've heard you should do this for the most popular group. Are there any other ideas? Are ...
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2answers
2k views

Replicating a plot from the ROCR Website

I'm trying to reproduce this plot from the ROCR website: I can get something similar as follows: ...