# Questions tagged [signal-detection]

Signal Detection Theory (SDT) explains how a receiver detects a signal in noise as a function of the receiver's sensitivity to the signal & the receiver's bias or tendency to assert the presence of the signal whether it is there or not.

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### Hypothesis testing on Probability of False Alarm

We have binary hypothesis testing problem as follows: $H_1$ (signal presence) : $y = s + n$ $H_0$ (signal absence) : $y = n$ Without loss of generality, to simplify the problem, let s be a constant ...
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### Finding a Size Invariant Pattern in Noisy Data

I want to find similar patterns in my data, I assume that the patterns will be of different sizes both in time and in amplitude. The usual distance metrics will not work here, since the window size is ...
26 views

### How to calculate metacognitive efficiency when SDT is not applicable to the first order task?

I'm currently working on some data from an associative-memory study. Participants have to learn associations between stimuli from two different classes (1 and 2). As stimulus from class 1 is presented ...
17 views

### Uncovering which frequencies two systems are communicating on by observing reoccurring time correlated signals and their frequencies

Suppose you have a set of communication systems {A, B, C, D}, which speak with each other as well as other systems not contained in the set. Our concern is how they speak with each other. They ...
8 views

### Applying ROC to evaluate time-series signal event picking model performance

I am trying to evaluate the performance of an event picking model that attempts to find the onset of a signal in a noisy time series. Data contains the true signal time (ground truth) and the ...
44 views

### Calculating d prime (d') using the Log-linear method (Hautus, 1995) in R

I have data from a memory test. I created a table with the absolute number of hits, misses, false alarms, and correct rejections. Each participant had 10 targets and 10 non-targets at each test (there ...
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### What are the effects on signal detection metrics when a base rate matching strategy is used?

Assume that: We have two groups of observers The base rate of the signal being present is 97% Knowledge of this base rate is provided to observers in the second group Group descriptions... tends to ...
1 vote
26 views

### Periods of High Activity Detection

So I have some sensor data (time series) of heart rate of some users. I want to detect the times they start and finish exercising. The data is sensor readings of heart rate every second, it's ...
101 views

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### Confusion between true negatives and false positives (double negation?!)

Given the below term definitions ..my question is: why is the logical negation (opposite) of a false negative not a true negative? This would imply 1-α=β, which does not have to be the case. And ...
1 vote