Questions tagged [frequency]

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

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15 views

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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35 views

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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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 ...
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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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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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1answer
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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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How to choose the frequency value without know the seasonality of the data in R ts() package

I am trying to analyze the S$P 500 data on Kaggle. I have a daily values of the opening stock prices. As frequency is the number of observations taken in a cycle, I am guessing I need to know the ...
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change in frequency of time series data

I am working on a survey data which is quarterly from 2008 to 2014 and it becomes bi-monthly 2014 onwards. Can someone please suggest how to tackle this data? It is not possible to interpolate due to ...
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Preprocessing of time series data to spectral analysis

If we want to find the periodicities of a time series, we can use spectral analysis. We can plot the the periodogram and find the major component, then we can find the major periods. But to do this, ...
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How to test normalized frequencies

I have extracted the frequency of two words (can, may) from two corpora (Corpus1, Corpus2). I want to test if there is a significant difference between the counts in the two corpora, but since the ...
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Statistical analysis for quasi-experiments

This is my first message on this forum. I hope I am not doing any mistake. I must analyze data obtained after a quasi-experiment and I am not sure how to proceed. The experiment has been carried out ...
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Which statistical test should be used for several samples frequency distributions?

I have the frequency distribution of muscle fiber size from several control and several problem animals and I'd like to compare both groups, but all the statistical tests I know for frequency ...
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How to do an equidistribution test? [duplicate]

Suppose I have a sample of $N$ numbers $a_1,\dots,a_N$ from $1,\dots,k$. How can I test whether they are equidistributed? I'm not interested in a full randomness test as the order does not matter to ...
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What time-series frequency should I use? Weekly, monthly, quarterly

First, I read the Q&As here, but it's not entirely clear for me what to do given my situation. I have more than 1700 different time series, each expressed as weekly data. My objective is to ...
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Should I use weekly or daily returns for modelling FX returns?

I am currently modelling Foreingn Exchange returns using a GARCH model. I am simulating returns 1-year forward. Would it be better to use weekly or daily data on Foreign Exchange returns? Weekly data ...
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1answer
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How can I use the distribution of run lengths to test if a sequence is generated from flips of a fair coin?

I have a very long sequence (in the tens of thousands) of binary outcomes from some data-generating process. I believe that these outcomes are iid Bernoulli trials with p = 0.5, equivalent to flipping ...
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Class frequency comparison (exponential distribution)

I have two different sources of data and I would like to check if their class distributions are similar and how much. The first dataset ($D_1$) has 2M samples and the second ($D_2$) 6M. When I ...
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Can VAR models capture all frequency interactions reliably and to the same extent?

I would like to assess how a set of ~50-100 time-series variables causally interact with each other. To do this, I am fitting a VAR model and using cross-validation to estimate model-order. After the ...
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1answer
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Specifying frequency parameter in the absence of occurrences

Let's say I have a process where the occurrences are independent, proportional to time. I made $n$ observations for which I only observed no occurrences. My goal is to define a frequency parameter and ...
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analyzing hierarchically grouped (selection) frequency data

I have a question regarding analyzing hierarchically grouped selection frequency data. (Disclaimer: I have never analyzed this type of data before. I did not think through the data analysis procedure (...
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1answer
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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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Count frequency distribution of monomial

If you sample $N$ times from a set of $n$ objects with replacement and then plot the frequency against the count (i.e. the number of times an object has been chosen once, twice,...), you get a ...
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Find out which characteristics to choose, based on the frequency measurement of characteristics of similar items

I have this statistics oriented question and I need some input on the approach. There is a new product introduced, a contact lence that has seleral ranges of attributes (powers) from which the users ...
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67 views

What is the correct distribution? [closed]

Let, I have the following Frequency Distribution: Which one would be the correct Grouped frequency Table if class-width = $1.0$? $Table\#1$ $Table\#2$ Explain "Why". What would be the answer if $\...
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Calculating effect sizes when a certain proportion of subjects give one of four answers

How can an effect size be calculated between two groups when the data is reported in frequency proportions (e.g., each group has people who have answered a question about relationships with either: ...
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1answer
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Expected vs observed frequency of two events at the same time

I'll first give an example and afterwards a more formal definition of my problem. Example: Let's assume I'm looking at balls with two properties: their color can be black or white, their weight ...
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1answer
280 views

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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225 views

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 ...
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Distribution of *conditional* frequencies when frequencies follow a Dirichlet distribution

Context: we have a large number of individuals characterized by two binary traits; call these $T$ with values $\{0,1\}$, and $T'$ with values $\{0',1'\}$. So there are four types of individuals: $00'$,...
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Fisher's exact test with opposite direction of categories for two groups

I would like to analyze student performance under two teaching approaches for two classes. We predict that class 1 would outperform class 2 and ideally the performance between two classes should be ...
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How to analyze the frequency of correct/ non-correct answers

I have a question about how to analyze some data. It involves the performance of two equally sized groups in a questionary with 30 arithmetic questions that I scored with two possible outcomes (...
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1answer
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Statistical test for comparing two frequencies with R [duplicate]

i have this situation. A set of 5000 objects, 4950 blue and 50 green. From this set two people (person A and person B) fish separately 100 objects each and i would like to know if one of the two ...
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What kind of frequency distribution is this?

I have a discrete frequency distribution, that looks like this I am trying to find what type of distribution is it? I looked at many models but it does not seem to comply with any. I have 345 ...
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calculating sample size needed for a target confidence interval from categorical data

So I will have data sorted into one of five bins (flow cytometry sorting of cells). These bins are actually adjacent categories that quantify a single fluorscence level (0-20,20-40,40-60,60-80,80-100)....
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How to approach cipher decoding using frequency analysis

so I'm working on a project where I'm trying to decipher an input text using frequency analysis. So far I've added first letter frequencies, common bigrams, double letter frequencies, as well as ...
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comparing multiple groups by frequency

I have three columns: first one is the number of innovations by handicapped students, the second column is the number of handicapped students in a class of a school, and the third column is the total ...
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Why is “using counts of a frequency table as data” for a histogram a “mistake”?

The textbook, The Practice of Statistics, states the following as a "common mistake" when making histograms: Don't use counts (in a frequency table) or percents (in a relative frequency table) as ...
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How to find the frequency at which loudness levels are varying the most?

I have a dataset consisting of loudness level readings of the sound produced at a national highway, taken on a per second basis at different frequencies(20Hz to 10,000Hz). I have to find out the ...
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Relative frequency question

I am a new user here, and I need some help getting started with the following question: The textbook answers are a. $19$ and b. $20$. How do I begin this question? I am a beginner in statistics. :) ...
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How to analyze size frequency data from over 70 sites

When I started my PhD, I had virtually no prep-time. My advisor needed me in the field and told me to go grab samples. As such, my planning wasn't the best, so sorry if this is a completely terrible ...
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How to transform a frequency data in to normal distribution?

I have this set of data: 0 700 1 350 2 250 3 300 4 150 5 145 6 150 7 147 being the first column about the type of the event (zero days, onde day, ...
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Estimating standard deviation from cumulative frequency table

I've been provided with some data in the form of a cumulative frequency table, where each value is exceeded a qiven percentage of the time, so for 99% of the time the readings exceed 163 and for 1% of ...
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What kind of statistical test should/could I perform in this set of data to detect an increase in email usage?

What kind of statistical test should/could I perform on this set of data ? Its done on the same group of 50 people before and after intervention. Any possible tests that could be done with this data ...
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Categorical Significance Test

I'm working on analyzing a dataset with the following structure: ...
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415 views

Find most common combination in binary data set in R? [closed]

I have a dataset with 7 variables all binary. I summed them across rows var8<- (x1+x2+x3+x4+x5+x6+x7) which gave me a vector of values 1:7 I then used the table functions to find the frequency ...
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1answer
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How to create a frequency table?

I am supposed to create a frequency table to describe the data using 4 measures: Raw frequency Cumulative raw frequency Relative frequency Cumulative percentage I don't understand what these mean, ...
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How to tell from SAS frequency distribution that something is off about my data?

For example, I have 3 questions asking about the quality of a restaurant's services. Each question asks diners to rate from 1 to 5, where 1 indicates the worst quality and 5 indicates the best quality....
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Frequency of an event at a given time, from a list of times of occurrence

I have data in the following format: [$t_1, t_2, t_3, \dots, t_n$] - which is a list of times at which an event has occurred during a day They are in minutes within 24 hours and limited by $t_{\text ...