# [BioC] Help on ROCR analysis

Wolfgang Huber whuber at embl.de
Sun Jan 10 15:21:44 CET 2010

```Dear Susan

consider following the posting guide,
http://www.bioconductor.org/docs/postingGuide.html. Also, the more
precisely you formulate your question, the more likely someone will
understand it enough it to give a useful answer.

Note that the ROCR package is not on Bioconductor, and if there is no
further response here, you may need to contact its authors directly.

Best wishes
Wolfgang

Bosco wrote:
>
> I'm a masters student at Manipal University,India,and am doing methylation data analysis.I subjected the data obtained to ROCR analysis using the commands:
>
> pred <- prediction(predictions, labels)
> perf <- performance(pred, measure = "tpr", x.measure = "fpr")
> plot(perf, col=rainbow(10))
>
> A brief set of "prediction" values in the data (\$predictions):
>
> 0.59836348 0.42820548 0.88141522 0.07484118 0.41030317 0.34349624
> 0.63349003 0.51225317 0.31789225 0.74818798 0.02281738 0.36549982
> 0.40980097 0.25466337 0.27680128 0.20879282 0.26144171 0.59784408
> 1.16341073 0.64634278 0.02603932 0.74096199 0.38492218 0.03429591
> 0.15660236 1.04699480 0.04065977 0.95849380 1.24050240 0.03268187
> 0.17247822 1.19127392 1.02523731 0.04234674 0.25061179 0.45305541
>
>
> However ,based on what criteria do you assign the binary values- \$labels: (1,0)?and also, how do you correlate these label values to the values of the prediction set?
>
> Thanking you,
> Yours Sincerely,
> Susan Bosco,
> MSc in Molecular Biology and Human Genetics,
> Manipal Life Sciences Centre,
> Manipal-India.
>
>
>       The INTERNET now has a personality. YOURS! See your Yahoo! Homepage.
> 	[[alternative HTML version deleted]]
>
>
>
> ------------------------------------------------------------------------
>
> _______________________________________________
> Bioconductor mailing list
> Bioconductor at stat.math.ethz.ch
> https://stat.ethz.ch/mailman/listinfo/bioconductor
> Search the archives: http://news.gmane.org/gmane.science.biology.informatics.conductor

--

Best wishes
Wolfgang

--
Wolfgang Huber
EMBL
http://www.embl.de/research/units/genome_biology/huber/contact

```