Questions tagged [frequency]

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

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Frequency table of a scale point in R [closed]

I have two items, which participants answered with a 5 point-scale. The respective variables are: ITEM01: 1 1 1 2 3 3 5 4 5 1 ITEM02: 5 5 5 5 5 1 2 1 2 1 I am interested in the number of ...
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Frequency of mutants in a very large number of observations

During cellular division (generation of two cells from one) bacteria experience mutations, where a newly produced cell harbors altered genetic code. To measure the rate of this happening Max Delbrück ...
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SNAIVE METHOD getting same result for different estimators (BU, OLS and STRUC) on THIEF package in R (TSAGGREGATES + RECONCILETHIEF)

I'm stucked and don't know how to solve that problem using thief package in R (actually tsaggragates + reconcile thief) for SNAIVE METHOD. Does anyone can check it and see what is wrong with it? If it'...
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test if one event is more frequent than another

I am observing 2 types of events with counts ($A$ and $B$) and I want to know if one is more frequent than the other for the time that I am observing. I know the chance of an appearance is uniform ...
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112 views

Why, in a grouped discrete data starting with zero, does the lower boundary start by -0.5?

My statistics book states that: Special care must be taken with class boundaries when drawing a histogram to represent grouped discrete data.....a continuous scale is used. Consider the group 0-9. ...
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Calculating confidence intervals for each class in a frequency distribution for a binomial distribution

This is a question from the book "Statistical Methods (6e) by Snedecor, Cochran": 10 balls, numbered 0 to 9, are placed in a box. For our sample, a ball is drawn from the box and then ...
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10 views

Correct survey choice order effect

I have a survey question that had yes/no answers only. The order of yes-no, no-yes was randomized. The results showed some order effects. Respondents tended to choose the first option. For example, ...
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Analysing event rate in a computer system for alerting

I'm trying to come up with an algorithm to identify how frequently specific events occur on a computer system, so that I can categorise them based upon their rarity. I can't keep a log of every event ...
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Statistical test of two groups of frequencies

I have two groups of frequency data with different sample sizes and want to perform a statistical test on them. Given that the origin is count data is a non parametric test such as ...
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How do you choose lag for measuring autocorrelation, aka estimating “periodicity” of a series or wave-like data?

I have wave-like data, that tends can have differing frequencies at any point. It'd be nice to be able to estimate a measure of "frequency" or "periodicity" or "...
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143 views

What's the meaning of “frequency represents area of bars” in histogram?

In some statistics lessons, I have heard that frequency represents area of bars. So I was curious and plotted these numbers: [1, 2, 1, 3, 3, 4, 5, 1, 4, 6, 7, 3, 7, 5, 7, 2, 8, 9, 10, 8, 10] The ...
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How to get a measure for the average “frequency” for wave-like data that changes frequency constantly over time?

Sure I can measure the average amplitude, but I'm interested in trying to get a measure for the frequency given the list of amplitude values within a certain time frame. Any ideas? Maybe not even ...
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Comparing the significance of multiple group frequencies in R

Suppose I have sum of frequencies from 4 groups with: ...
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92 views

What model to use for analyzing age frequency data? issues with linear model in R

I have this data in R and I'm trying to statistically analyze whether high age zeros (column n) in each year is significantly correlated to the next years age 1 fish (n.1), and the next years age 2 ...
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What distribution would be appropriate for conducting a glm on frequency data?

I have a dataset of frequency of certain variables occurring in samples with two sample groups. What is an appropriate distribution to use in a glm on this kind of data? I can't use any of the count ...
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How can I do fishers exact test if only frequency is available not the count?

I want to compare two allele frequencies from two populations. I use Fisher's exact test for this. But I don't have the actual count of the alleles but just frequency. For eg: Frequency of Population(...
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How to calculate similarities/distances and conduct cluster analysis from contingency table

I have an 18x25 contingency matrix, rows are behaviors observed and columns are environmental features. I conducted a correspondence analysis via the CA() function in R and then clustered using the ...
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Can you perform a Fourier transform of a Frequency / Time plot? (Number of phone taps (t))

I'm working on a thesis problem. I need to analyze tapping behaviour (number of phone taps). The raw data is the time stamp of every app, and the app in use. It was recommended to me that I create a ...
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35 views

Statistics of Frequency given Time Intervals

We are analyzing some heart rate algorithms to understand their accuracy. We are interested in calculating statistics for the heart rate in beats-per-minute. The input data is beat-to-beat interval (...
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How to identify the frequencies of periodic peak signals in a noisy time series? (with R)

Suppose to have two time series with peak signals at different frequencies, like these two: ...
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What is the Frequency Modulation (FM) Synthesis formula?

I am very confused with the FM synthesis formula I had summarize below in a Latex (because I do not know how to type all the fomular here) But whey all the formula is different?
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Which test for: Intervention study (before/after) with binary dependent variable sampling frequencies from multiple clusters

I am looking for the best statistical test to test hypotheses for the following study setup. I have 12 locations. At each of these locations I observe 200 people and note their compliance (Yes/no) ...
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Interpreting GLM with poisson distribution outputs for assessing affect of two categorical variables on frequency

I'm currently trying to see if the frequency of a behaviour measured in a binary format (yes/no (where yes means the behaviour is present) is related to 1. the month in which behaviour took place and ...
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Periodogram explained

If I plot a periodogram of let's say sin(20x) + 2sin(80x) and it looks like this: What does it say, i.e., how do I interpret this periodogram? How could I compute ...
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Compare frequencies and adjust for other variables

I have an outcome variable with four levels (o to 3) and a predictor with 5 levels. Is there a way to statistically compare the frequency differences, while adjusting for other variables (sex, age)? I ...
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Derive summary statistic Grouped Data & Frequency Distribution Table

I have the following data from the 2018 American Community Survey for a number of census block groups: ...
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What test do I use for comparing count data for significant differences between two groups of different sizes?

I need to compare count totals between two groups that are of unequal sizes. For example see table: Total injuries includes back/neck injuries. I am looking to see if the back/neck injuries are ...
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observed frequency vs expected frequency plot interpretation

I'm trying to understand the output of a plot that considers the observed frequency and expected frequency. More or less I've thought that plotting the observed values against the expected values will ...
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Frequency of a value in R [closed]

If there is a data set in R and I want know how many of one value is in it, is there a command for this? thanks
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Chosing seasonality frequency

i am trying to build a general forecast at work, but i am in trouble about the frequency of my series. Can a subject reason guide me through the frequency selection? I have daily data, so i could ...
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27 views

Compare Event frequency in two different data set

Assume we have two groups of categorical data: Group A: 10000 categorical events, such as Event1, Event2, Event3, ..., Event10 Group B: 100 categorical events, same events of group A, but recorded at ...
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Comparing frequencies in two groups between two time periods

I've got data that are essentially set up in two 2x2 frequency tables. I have frequencies that males and females disperse or recruit to a given region. I am interested if the proportion of sexes that ...
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Estimate frequency of event within a time series

I'd like to solicit opinion on a statistical approach to solve the following problem: Calculate a person's regular bills based on their bank account transactions For example, suppose a person pays ...
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Using a randomization to compare frequencies in two groups?

I have a dataset of males and females and whether they dispersed (yes = 1). For example: Male 0 Male 0 Male 0 Male 0 Male 0 Female 0 Female 1 Female 0 I'...
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Understanding the meaning of different standard deviations from different values [closed]

Disclaimer: Before I stated the question, I should say that I'm very new at the area of statistics and the understanding of its application. So I ask you people to please be patient with me because I'...
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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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142 views

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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122 views

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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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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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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1answer
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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 ...
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6answers
355 views

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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118 views

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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