# Questions tagged [false-positive-rate]

In a test for a condition (such as a disease) the false positive rate is the proportion of subjects incorrectly classified as having the condition.

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51 views

### How to interpret a False Discovery Rate plot

It is the first time that I am trying to calculate the FDR and I use the fdrtool package in R. I want both, local and tail area graphs and I think the third ...
35 views

### Does up-sampling lead to lots of false positives in production?

Say we have a dataset with a binary outcome variable that takes the positive case (outcome = 1) roughly 20% of the time. Often, we would modify the training set by ...
12 views

### Sensitivity and specificity with multiple sequential tests

This has been on my mind for a while, and I would appreciate a statistician's view on the matter. Suppose that a given test has sensitivity $a$ and specificity $b$. Now, periodically apply this test ...
16 views

### How do you cope with the risk of false-positives in exploratory analysis?

Let's say that I'm running exploratory analysis on a dataset. For instance, let's say that the dataset consists of several features and two groups and I want to see which features are significantly ...
15 views

### Procedure to Smooth Noise for Threshold Values

Suppose I am looking at an estimate $\hat\beta$ in a clinical trial data. With $a=.05$, a patient with $\hat\beta>1$ is considered to have some medical condition. A daily example could be a 24-hr ...
39 views

### Deriving a loss function properly accounting for different error type costs

Consider a classification setting like a medical test: Not finding an existing health issue might be much worse (by a factor of 50) than assuming an issue when there is none. I.e. a setting in which ...
33 views

### Exclude areas of feature space without getting false negatives

I am using a decision tree classifier to split the feature space according to two classes ( A and B). Events of class A are important and I want to classify all of them correct, i.e. no false ...
142 views

### What is the integral of the False Positive Rate over the False Positive Rate, compared to the AUC?

In machine learning the Area Under the Receiver Operating Characteristic Curve ($AUC$) can be illustrated in a plot of the True Positive Rate ($TPR$) against the False Positive Rate ($FPR$). Formally, ...
45 views

### How to make really bad results from a machine learning model better by reversing predictions

I trained a classification model on some data with two classes and have really low accuracy. I have a false-positive rate of 86 % for both classes I am trying to predict. I was wondering if I could ...
6 views

### Many identical false negatives in multi-output classification

I used an XGB model to classify 12 categories (I call them classes 1-12). I've found that a particular false positive, 5, is predicted frequently for what should be '2', according to the actuals that ...
49 views

### Interpretation of AUC - ROC curves with a Binary Predictor

I have data like this: ...
81 views

### Equal Error Rate (EER) Metric - Why is lower better?

With the Equal Error Rate (EER) Metric, why is the lower the value the better (more accurate binary classifier system)? Also, when finding the EER on the ROC curve, is it correct in saying the EER is ...
20 views

### Correlation between two non-independent samples (dichotomized data / multiple testing)

I've been looking through text books but unable to find a precise answer to this question, but it seems important so maybe I'm looking in wrong places. Imagine some population with a normal ...
8 views

### Any way to give a predicted value for FDR if you know the ⍺-level + the number of comparisons?

I'm writing a school paper on false positives and the multiplicity problem. I want to show that multiple testing inflates the false discovery rate (FDR) and that FDR increases with the number of ...
28 views

### False positive rate with multiple dichotomisation

There are reasons this is bad practice, but I want to try and calculate the following - if one takes a distribution (say a normal distribution) and applies $n$ multiple dichotomisations to it and chi ...
54 views

### One-Class SVM threshold parameter

I have to implement metrics FPR at 95%TPR. In order to do that I have to look for the different decisions of OCSVM dependent on the threshold. If I execute this simple code: ...
247 views

### How can I fix type 1 error for my logistic regression model?

I am testing if the sound pressure levels(rms) of shipping noise affect the presence or absence of the fin whales by acoustic monitoring for 4 months of data from one location. Here my response ...
30 views

### How do you combine confidence intervals for antibody test estimates?

I would like to know how to combine the uncertainty related to the false positive rate of an antibody test with uncertainty due to sampling. As an example, let's use the recent New York State estimate ...
104 views

### Oversampling/Undersampling in respect to Train and Test - Isolation Forest

I've got a quite imbalanced data set. 144.496 : 162 -> ratio of 1000:1 I would like to use IsolationForest to detect the 162 anomalys. I've already split the data. However, the iForest doesn't ...
13 views

### Estimating false accept rates from imposter scores below a threshold

I have a system that compares two items and produces a match score. Scores below a threshold are manually inspected to determine if they match or don't(imposter). Scores above the threshold are ...