# Questions tagged [frequency]

The frequency measures the number of times an event occurs in a data set.

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### Period detection of a generic time series

This post is the continuation of another post related to a generic method for outlier detection in time series. Basically, at this point I'm interested in a robust way to discover the periodicity/...
110k views

### Mean absolute deviation vs. standard deviation

In the text book "New Comprehensive Mathematics for O Level" by Greer (1983), I see averaged deviation calculated like this: Sum up absolute differences between single values and the mean. Then ...
2k views

### How to measure the statistical “distance” between two frequency distributions?

I am undertaking a data analysis project which involves investigating website usage times over the course of the year. What I would like to do is compare how "consistent" the usage patterns are, say, ...
3k views

### What's a good approach to estimate the probability of word frequencies?

I have a document corpus and I want to estimate the probability of occurrence of a certain word $w$. Simply calculating the frequencies and use such a number as an estimation is not a good choice. Is ...
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### Why does multiplication in the frequency domain equal convolution in the time domain?

This question came in the context of understanding how to get a distribution of a sum of two iid random variables. I'm working through the top answer to this question Consider the sum of $n$ uniform ...
3k views

### How to figure out what numbers often appear together in a dataset?

I have a lottery style dataset we produce internally (example below). I am trying to figure out which numbers appear most frequently together. Example questions: What are the top 10 pair of numbers ...
913 views

### Frequency jump detection

It is generally known that 'jumps' in frequency data are difficult to estimate. In the current literature, many different techniques for estimating such jumps have been tested and often with ...
721 views

### chi-squared to test if two variables have the same frequency distribution

I want to test if x and y have the same frequency distributions using chi-squared. In my code below, I've concluded that because ...
586 views

### How do I quantify the uniformity of sampling time?

My datasets cover a long time, say 20 years, and the data are sampled at different time. For example, some are obtaiend at 1:00(stored as 100), some are 23:00(2300). If I plot the histogram of the ...
4k views

### Chi-squared distribution for dice not returning expected values?

I'm trying to verify that my dice are reasonably fair and balanced. I'm not sure I'm doing it right, though, since I'm basically teaching myself stats without references. To achieve this, I've settled ...
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### Most significantly frequent category

I am measuring the frequency of consonants in a sample lexicon of a language. The results are as follows: ...
2k views

### Statistical comparison of two signals

I need to develop an algorithm that will compare two signals and generate some metric(s) to describe changes between them. Signal processing and analysis isn’t my strong point so I would appreciate ...
1k views

### Visualization of binned frequency distribution in R

I am trying to visually represent the distribution of last names in the US. Specifically, I am trying to show that the distribution is such that the most common names (say the top 50) are very common ...
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### How to estimate the Poisson distribution with one event occurrence?

Let us say we observed one event on 1 Jan 2005, and we were observing the events since 2000. What's the best estimate of Poisson distribution? One approach is to set intensity $\lambda=1/18$ per year....
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### How do I compare frequency data of more than two groups?

I am comparing the frequencies of a disease presenting in particular season. The expected proportion would be 0.25 and the observed frequencies for spring, summer, autumn, and winter were 7, 9, 11, ...