Questions tagged [frequency]
The frequency measures the number of times an event occurs in a data set.
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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} ...
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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 <...
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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 ...
Alan Morales
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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 "...
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Weighted entropy using similarity scores
I have a list (freq) of letters with the following frequencies:
...
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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 ...
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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 ...
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Histogram normalisation: a question about the correct terminology
Given a histogram and the following quantities
...
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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 \...
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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 '...
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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 ...
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Comparing cells from two crosstabs / chi-squared goodness of fit test?
I have two crosstabs that I'd like to compare for each cell for significance. Both crosstabs have the same variables and the same amount of total observations, but the frequency distribution is ...
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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 ...
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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 ...
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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. ...
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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 ...
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Distribution and difference between two categories in two corpora, and comparison
Building on this question:
I'd like to compute the difference between the presence of a 2 level factor in 2 datasets, and see whether this is significant.
For instance, let's say I want to find 2 ...
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CNN on time-domain vs. frequency-domain input
I have a short question regarding the application of CNNs on a time-domain signal vs. the same signal in the frequency domain.
Let's say I have time series data (with multiple channels, e.g. from an ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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Impute answers in a survey according to a target distribution and initial biased information
Having a look at self reported unemployment duration in the Current Population Survey, number preference plays an important role. Instead of a falling distribution curve, you can observe peaks in ...
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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 ...
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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 ...
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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 ...
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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:
...
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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 ...
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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 ...
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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:
...
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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 ...
user318514
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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?
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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?
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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 ...
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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 ...
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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:
...
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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 ...
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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 ...
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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, ...
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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-...
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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
...
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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 ...
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Why should the frequency of heads in a coin toss converge to anything at all?
Suppose we have any kind of coin. Why should the relative frequency of getting a heads converge to any value at all?
One answer is that this is simply what we empirically observe this to be the case, ...
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Likelihood that observed relative frequencies match a probability distribution
For this question, please assume probability distributions are discrete.
If I have $N$ data points ($x_1, x_2, ..., x_N$), and I want to know the likelihood that these samples came from a discrete ...
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Occurrence certainty
I think the best way to ask this question is with a hypothetical situation. Let's say I have a sensor that measures on average one occurrence every 3 days with a standard deviation of about 4. I want ...
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How variability with different data densities could affect comparisons among environmental variables
I have several sets of data continually measured and recorded by instruments. The periods of record are 30+ years and the frequency of measurement can be every 5, 10, 15, or 30 minutes (288, 144. 96, ...
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How to specify frequency higher than months for time series
How do we set frequency if we have data with frequency that is higher than months in a time series?
If we use months, we can set frequency to 12, but for daily data ...
user248711
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How to compare the frequencies by multiple groups?
Here are my data. Each row represents a sample and different VAR mean different component.
...
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What does the y-axis in this Frequency vs Residuals graph mean?
(Asner et al 2013)
This is on a paper I'm reading, and I get the residuals part, but I'm not so sure on what the frequency means. Can someone please explain these graphs?
Please let me know if you ...
