# 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 ...
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### 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 ...
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### 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 ...
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### 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 ...
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### 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 ...
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1 vote
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### 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 ...
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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 ...
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1 vote
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### Detecting a tremor given accelerometer data

I'm trying to figure out what technique to use in order to detect a tremor in accelerometer data. I have the acceleration in the x, y and z coordinates. I've plotted 4 graphs of this data below with ...
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