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Questions tagged [frequency]

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

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How to accurately estimate the probability of a rare event in a large dataset?

I have a dataset of 30,155 names and out of curiosity I verified that the longest name has 68 characters, which is quite big considering the mean and SD were 24.78 and 5.64, respectively. Based on ...
WordP's user avatar
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2 votes
1 answer
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Check if the charachter frequency of two "words" are significantly different

Although the problem as in the title might sound a little odd, I have a dataset where each entry includes two "words" that include 1000 and 1100 characters respectively. For each entry, I ...
mantaray's user avatar
0 votes
1 answer
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How to easily convert frequency data into raw data (large dataset) for t-test? [closed]

Statistics goal: Determine if the difference between two datasets is statistically significant. Dataset description: The data is available in the form of particle size (mm) v. particle count (...
Dana Tran's user avatar
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How to compare frequencies of type of stress events with repeated measurements over time in a weekly diary study?

We hope you can help clarify whether a Chi-square test of equal frequencies (in SPSS) would be the correct choice. Study participants have reported experienced stress events (text variable) in a ...
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Can I use Chi^2 to test significance in frequencies of three groups?

I have conducted fieldwork on tree seedlings in plots with different treatments: natural, managed, and fertilised. The dataset consists of the frequency at which the different tree species occur. I ...
Thomas's user avatar
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8 votes
2 answers
232 views

Best plot in R for count data with a broad range and lots of low frequency data

I have a data set that looks like this, in reality there are about twenty categories with a count of 1: ...
tacrolimus's user avatar
2 votes
1 answer
102 views

Chi square test (or alternative) for mixed design categorical data

I have the following question: I collected the number of different symptoms at two time points (Baseline BL, Follow-up FU) in two groups (Control Group CG, Intervention Group IG). So, there is a ...
Manuel Leitner's user avatar
4 votes
1 answer
164 views

Can I use logistic regression if one category of the dependent variable has a very low frequency?

An example of 100 subjects. Let's say I wish to study the impact of literacy levels (0 as limited and 1 as adequate), anxiety levels (0 as no anxiety and 1 as severe anxiety) and sex (0 for female and ...
An116's user avatar
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Is it possible to test for causality using Bayes theorem and frequency tables?

I am used to test causality using Granger test with time series. But I don't know how to test for causality with categorical data. For instance, I want to test if a high level of hardskill causes a ...
Siva Kg's user avatar
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How to test if a particular frequency is significant or not in a fourier frequency spectrum

I have got a timeseries data with which I plotted a frequency spectrum and I could eyeball all the significant peaks (significant frequencies) in the plot. But I want to do this for a spatial data (...
arya lakshmi's user avatar
3 votes
2 answers
362 views

Goodness-of-fit test for very skewed data [closed]

I am working with two quite large datasets (9000 obs and 3800 obs). Each observation has been grouped into 1 of 12 categories and I am looking to test if the frequency of categories in the smaller ...
Elin Sjoeholm's user avatar
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Is the spectrum of a signal circularly symmetric if the signal itself is circularly symmetric?

Let’s consider a signal that is circularly symmetric complex Gaussian process (proper): $$ s \sim \mathcal{CGP}(0, C, 0) $$, and, the covariance has the following form: $$ \mathbf{C} = \mathbf{C}_{rr} ...
CfourPiO's user avatar
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Stationarity and Chow-Lin disaggregation

My goal is to have higher frequency data (quarterly) for the GDP of my region (yearly data) through quarterly auxiliary data. Therefore my goal is to perform a Chow-Lin regression using the package <...
Anna's user avatar
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Is there any other method besides inflection point to find the origin of positive rates?

So I have this dataset that looks like this. Income is the amount of income customers at a grocery stores reportedly make. Campaign is whether the customer accepted the campaign, 1 if they did, 0 ...
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-1 votes
1 answer
56 views

Apply divergences between two "relative frequency distributions", instead of between two "probability distributions"

Introduction. Recalling that: The frequency is the number of observations of a specific outcome. The relative frequency is a proportion of all observations (frequency / total observations). A "...
Ommo's user avatar
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Weighted entropy using similarity scores

I have a list (freq) of letters with the following frequencies: ...
isthisthat's user avatar
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49 views

What are differences, or relationships, among "relative probability", "relative frequency", "probability density" and "probability"? [duplicate]

ORIGINAL QUESTION What are the differences, or relationships, among "relative probability", "relative frequency", "probability density" and "probability"? A ...
Ommo's user avatar
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Comparing two identical surveys from 2019 and 2023. Each question has multiple items including "don't know"

I have this dataset made up of several questions, each with ordinal answers (likert-like) which unfortunately include a "don't know" option. The dataset is split in two: one portion from ...
wuhwuh12's user avatar
2 votes
1 answer
73 views

Histogram normalisation: a question about the correct terminology

Given a histogram and the following quantities ...
Ommo's user avatar
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0 answers
59 views

Bayesian model (Gibbs sampling) with frequency data for non-standard distribution

I have the following model. \begin{align} X &= D\,(F+S\,(1+G)) \\ D &\sim \mathrm{Exp}\,(\lambda) \\ F &\sim \mathrm{Unif}\,(0,1) \\ S &\sim \mathrm{Poi}\,(\sigma) \\ G &\sim \...
jessexknight's user avatar
1 vote
0 answers
34 views

I want to know how this graph is being created? [closed]

I found this plot in a paper. I have found similar plots in other papers from the same team. It is basically the comparison of MODIS C6 and C5 products with AERONET. I wanted to understand what that '...
Ray's user avatar
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41 views

Full time-series analysis steps

I had a few classes related to time-series econometrics, however most were theory heavy. I would like to practice this, so I will try to analyse few stock prices, however I am not fully sure about the ...
JohnFire's user avatar
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2 votes
0 answers
14 views

Power for hierarchical loglinear model

Can anyone point me in the right direction for doing sample size/power calculations for hierarchical log-linear analysis of nominal (frequencies) data? Would I get in trouble with reviewers for just ...
Steve's user avatar
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2 votes
1 answer
78 views

Determine seasonal frequency from the values of the time series alone

What are some algorithms for determining the seasonal frequency (or equivalently, the length of the seasonal period) from the values of the time series alone? That is, the values of the time series ...
Richard Hardy's user avatar
2 votes
1 answer
262 views

Comparing statistically the distribution of frequency between several groups

I have a set of data corresponding to several groups (group1, group2,...) split into 7 categories (cat1, cat2...). For each group, I have counted the number of individuals belonging to each category. ...
antigone nemo's user avatar
2 votes
1 answer
49 views

Why does my textbook say this is not a frequency distribution / not categorical data? It looks like one to me

I am reading an intro to statistics textbook, and they were telling us about pie charts. They were saying that pie charts can be used for categorical data sets. But then they said that they can be ...
Remot's user avatar
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1 vote
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113 views

Can we apply a permutation test to compare two percentage distributions?

Any help here will be greatly appreciated! Suppose we have two groups, one composed of ET's from Mars and another from ET's from Jupiter (assuming there are ETs there). Then, these groups of ETs meet ...
Jean Tardelli's user avatar
6 votes
2 answers
108 views

Statistical test to assess significant difference in landcover selection

I have GPS collar data that I have used to extract values to points through ArcGIS Pro on MODIS landcover data. From this, I have a record of the number of times the animal has been in each landcover ...
Chelsea_VictoriaS's user avatar
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120 views

finding the average frequency of square wave that varies slightly using python

fairly new to data science in python, looking for some help. If I have an array of ones and zeros, which is roughly say 1000 elements zero then 1000 elements one and so on, and an array of time data ...
FillenNaymeer's user avatar
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23 views

A question about the right statistical test

let's say that I have a table as follows SSE1 SSE2 SSE3 SSE4 SSE5 frequncy 125 200 259 300 200 and I want to see if there is a ...
An116's user avatar
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1 answer
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Bayes theorem applied to letter frequency for simple substitution ciphers

Given a message encoded with a simple substitution cipher, I would like to estimate the probability of each letter representing a given letter key, based on letter frequency analysis. I am not as ...
Brent's user avatar
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1 vote
2 answers
90 views

What type of statistical test can I use to look at the influence of a factor on a frequency distribution (distance)

I'm trying to work out what test to use to see whether a factor (presence vs absence) affects a frequency distribution with distance as a predictor. Just wondering if anyone knows what the best test ...
timeywimey's user avatar
0 votes
1 answer
197 views

Is it possible to compare different frequency distributions with ANOVA and how would you go about it?

For example if I have three different samples of red blood cells, and I created a frequency distribution of the red blood cell size for each sample how would I run ANOVA to compare the differences ...
Flooreen's user avatar
0 votes
1 answer
713 views

Fisher's test and difference between observed and expected frequencies

I was trying to make sense of a statement I came across in a paper. The author states that "The difference between the observed frequency of zero and the expected frequency can now be tested for ...
Rafael Herrera's user avatar
1 vote
0 answers
16 views

processing natural language that descripe time frequency with R

I'm dealing with data that descripe onset frequency of a symptom. The text in each cell was not in the same format. For example: ...
Ian Wang's user avatar
1 vote
0 answers
140 views

Time Series Seasonality and Frequency

I am working with a time series that indicates the number of times a user logs into an application per minute. I want to find an algorithmic way (in Python) that would detect if there is any pattern ...
Iamtrying's user avatar
1 vote
1 answer
63 views

Which test to compare the difference between the amount of job categories for men and women

I have a dataset with men and women (independent variable) and want to know if the job spectrum (dependent variable) of the men is broader than the job spectrum of the women. Their jobs are ...
Astrid Jehle's user avatar
2 votes
1 answer
83 views

Is there a way to combine frequency and magnitude into a single variable?

I have some data where I observe something at a certain frequency each month. Each time I observe, I count a value of 1 if true or 0 if false. The data looks like this: ...
Frank's user avatar
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1 vote
1 answer
368 views

May the cumulative distribution function be used to calculate the inter-quartile range and vise-versa?

May the cumulative distribution function be used to estimate the inter-quartile range? I am drawing their similarities. The IQR is found via a boxplot which has percentiles. A percentile comes from ...
user avatar
-1 votes
0 answers
23 views

Find mean value of total N with only relative frequency and mid point histogram [duplicate]

I have the following data of number of vouchers redeemed : How can i calculate the mean value of total vouchers?
mafalda's user avatar
-1 votes
1 answer
187 views

Calculate mean of sample size based on relative frequency in histogram [duplicate]

I have the following data of number of vouchers redeemed : How can i calculate the mean value of total vouchers?
mafalda's user avatar
1 vote
1 answer
50 views

Comparison of total counts vs. comparison of mean counts per participant in exploratory data analysis

I already came across this question: Difference in means vs difference in proportions, but could not answer my question based on the answers and comments there. My question would be this: Suppose ...
alex's user avatar
  • 13
2 votes
1 answer
81 views

What test to compare two frequencies?

In my project I have to study the vigilance behaviour of birds, and I need to determine if adults start escaping from an approaching human more often than chicks. So I have the frequencies of adults ...
balzy's user avatar
  • 139
1 vote
1 answer
437 views

How to calculate harmonic equations from a complex wave

I’m working through an online example that explains spectral analysis in R. Let’s say you have a complex wave: ...
giopico's user avatar
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1 vote
0 answers
33 views

Scientific reporting of time-varying covariates at different time frequencies

Say I have the following model: $$y_{it} = \gamma_i + \delta {T}_{it} + \zeta Z_{i(k)} + \epsilon_{it}$$ where $y$ is some outcome for household $i$ in month $t$. $\gamma_i$ denotes household fixed ...
Thomas Bilach's user avatar
1 vote
1 answer
45 views

Which statistical test to compare frequencies across groups?

I am running an analysis in which I want identify if there are significant differences in the features that make up two groups: people that commit crimes against children and people that commit crimes ...
sallicap's user avatar
0 votes
0 answers
80 views

How do I decide the frequency of data capture for modeling?

I plan to capture data to predict energy consumption in a food processing plant. I want to capture production details such as how much each category of food is produced, what is the machine's output, ...
NAS_2339's user avatar
  • 223
0 votes
0 answers
39 views

How to model discrete bivariate probability distributions with a 'triangular' support?

I'm really at a loss as to what this is called, so please tell me if this is a duplicate and I'll be happy for the question to be deleted if that is the case (though I likely will still have follow-...
WavesWashSands's user avatar
1 vote
0 answers
282 views

Combining multiple columns in R to get frequency count? [closed]

I have incident data and for each incident, there are multiple individuals each with sex/age. The data looks something like this: incident person1 personl1sex person1age person2 person2sex person2age ...
burphound's user avatar
  • 117
0 votes
0 answers
31 views

What are the name of this distributions appeared on bitcoin trades data?

I have been playing with some bitcoin data that i download from binance API the data correspond to 1min klines there is 1 million of samples that start from 01/08/2020 to 01/02/2022 if i make a ...
Bender Robot's user avatar

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