# Questions tagged [frequency]

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

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### What is the median age of the clients? 2. Are the mean and the median number of sessions completed the same? [closed]

No. of sessions completed f % Σ% ...
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### Comparing frequency distributions of two samples

Consider the following two samples (numbers are put here for illustration): \begin{array}{|c|c|c|c|} \hline & males & females& other \\ \hline \textrm{Sample 1} & 100 & 150 &...
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### Hypothesis testing for apriori market basket analysis

I'm wondering if there is a possibility to perform hypothesis tests to show that the resulting rules from an apriori market basket analysis are statistically significant? Maybe I'm missing the forest ...
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### Compare frequency counts between two groups with 300 observances(variables)

I have a dataset with observations of counts (I've also calculated proportions of the total) between two groups. These observations are essentially on the presence of material types. I'm trying to ...
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### Compare frequencies for nominal values between two groups

I collected two sets of usability problems during a user study and an inspection done by experts. Each problem was assigned to a category. I want to find out if there are significant differences in ...
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### Locating and characterising changes in event frequency over time

I have simple time-series data which consists of just one kind of time-stamped event. I'd like to understand when and how the frequency changes. In particular, with regard to one very obvious change ...
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### Is Rule of Three inappropriate in some cases?

I'm building binomial proportion confidence intervals for a patient dataset containing the frequency of home nursing visits during the week prior to hospital admission. The freq. of home visit ...
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### Zero Frequency and Small Sample Size

I have a situation where the skeletons from one of three archaeological sites do not display a bone condition called periostitis that is found at the other two. The relevant statistics are: ...
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### How to compare frequency distributions

I have one categorical variable that can assume 5 possible values: 1, 2, 3, 4, 5. I observe the value of the variable in two samples of different size. Now I want to compare the frequency distribution ...
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### Compare two unbalanced contingency tables in r

I have two df that I convert to contingency tables, each df identifies two sets of survey questions results in two different months. The number of rows of the dfs is different, meaning that surveys ...
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 ...
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### Specification on power spectral density for population data

What is the best way to put a specification on the single-side auto-power spectral density (PSD)? We have a product for which we have a time signal. For this signal we calculate the PSD (or ...
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### Why does TF-IDF use the count of the most common word in the document instead of total count of all words in the document?

From what I understand, the "term frequency" ("TF" in TF-IDF) is calculated from the number of times a certain term occurs in a document vs the most common term in a document: ...
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### Extracting the right summary statistics from zero-inflated data sets (i.e. a sparse matrix where everything non-zero is a statistical outlier)

I'm a consumer tech startup founder with rudimentary background in statistics. I need help in processing a large, sparse matrix. I'm logging all actions users are undertaking in my app. I then ...
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### Methods for analyzing “cross-frequency” tables?

I am looking for a statistical method that is suitable for the problem: which goods in my shop are most frequently bought together, and which aren’t? For my commodities, I can make a table like this ...
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### 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, ...
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### What is the difference of frequency and probability of occurrence?

I'm reading lots of statistical anomaly detection articles nowadays. Some of them use frequency of some feature for detecting anomalies on the new trace. But, something gets my attention in some ...
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### How do I find the mean of counts of reported events when the last category is “5 or more”

I know that we can find mean (No. of errors per patient) from 0*5+1*30+2*56+3*15+4*10 But for 5 or more, what do I need to do?
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### Cepstrum: quefrency scale to frequency scale

Can someone please explain to me how to convert a quefrency scale to the corresponding freqncy? For example consider this: A voice signal is measured at 50kHz sampling frequency and FFT power ...
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### Comparing the distribution

I want to compare the distribution of 2 independant datasets. Measurements were performed on an experimental dataset (TEST) and compared with a completely independant reference dataset (REF). The idea ...
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### How to compare frequencies among groups?

I want to compare the frequency of a categorical value among 4 groups, what statistical test should I use? (I am using SPSS). I am looking for a statistical test that would allow me to say: the ...
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### Are theoretical probability and relative frequency comparable?

Speaking of probability measure (a number from 0 to 1), textbooks usually describe several interpretations of this number. E.g., Practical Business Statistics by Andrew F. Siegel reads (p. 132): ...
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### Is it allowed to average annual frequencies to make a time series evenly spaced?

I have a time series with observations that were collected quasi fortnightly over several years. However, there are between 23 and 26 observations per year. The time series is not equidistant, due to ...
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### Measure like relative frequency that also weights the total [closed]

Background I see a lot of publications mentioning relative frequencies to indicate the presence of certain genes in a specific area. For example: ...
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### Analyzing Accelerometer and Gyroscope Data on a Drone

I am using an MPU-6050 Gyroscope and Accelerometer for a drone flight controller. I have been able to get raw data from the sensor, and account for bias and use the included Digital Low pass Filter at ...
406 views

### Calculate mean from cumulative percentage table

Is it possible to calculate mean from cumulative percentage table below? Scenario: Bob is a manager. He is trying to estimate the sales for the next year, and from his experience, he knows the sales ...
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### Granger causality tests when series are measured at different frequencies

As a research exercise I should perform Granger causality tests on pairs of national series (one describing output gap and the other an index of consumers' confidence). However, I face a situation ...
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### Testing an intervention by repeated measure of opinion before and after the intervention

How can we test the null hypothesis that an intervention has no effect on opinions for 44 people. These opinions were measured as frequencies in 3 categories (A, B, C) before and after the ...
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### Estimate frequency based on given sample

I have a list of users (~25 million) and a dataset containing events created by the users in a specific time window (eg all tweets of all Twitter users that happened in a month - on avg I have 100K ...
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### Frequency distribution of volumes of spheres is positively skew if the radii are symmetrically distributed

Suppose the frequency distribution of radii of $n$ spheres is symmetric. Show that the frequency distribution of the volumes of these spheres is positively skew. I am trying to show this using Bowley'...
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### Regression with frequency rating in percent as dv

I seem to have a similar issue as asked in this thread, nevertheless I'm still clueless about what model I have to fit to my data. I conducted a repeated measure experiment (consisting of 2 sessions) ...
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### Is it possible to obtain more accurate annual extremes predictions from sub-annual data?

I'm looking at various extreme climate variables, such as 50-year or 500-year maximum daily precipitation, using a generalized extreme value (GEV) distribution. The problem with this is that there are ...