Questions tagged [frequency]
The frequency measures the number of times an event occurs in a data set.
295
questions
0
votes
0answers
8 views
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 ...
2
votes
1answer
54 views
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 ...
0
votes
1answer
25 views
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'...
0
votes
1answer
33 views
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 ...
3
votes
1answer
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. ...
4
votes
1answer
43 views
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 ...
0
votes
1answer
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, ...
0
votes
0answers
11 views
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 ...
0
votes
1answer
15 views
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 ...
0
votes
0answers
3 views
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 "...
1
vote
1answer
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 ...
0
votes
1answer
10 views
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 ...
1
vote
0answers
13 views
Comparing the significance of multiple group frequencies in R
Suppose I have sum of frequencies from 4 groups with:
...
1
vote
1answer
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 ...
0
votes
0answers
41 views
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 ...
1
vote
1answer
27 views
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(...
1
vote
0answers
19 views
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 ...
0
votes
0answers
7 views
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 ...
1
vote
1answer
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 (...
1
vote
0answers
27 views
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:
...
1
vote
0answers
9 views
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?
0
votes
0answers
11 views
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) ...
1
vote
0answers
34 views
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 ...
1
vote
1answer
30 views
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 ...
0
votes
0answers
6 views
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 ...
2
votes
0answers
24 views
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:
...
2
votes
1answer
30 views
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 ...
1
vote
1answer
37 views
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 ...
0
votes
1answer
18 views
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
0
votes
0answers
24 views
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 ...
0
votes
1answer
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 ...
1
vote
0answers
17 views
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 ...
0
votes
0answers
20 views
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 ...
0
votes
2answers
37 views
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'...
1
vote
0answers
22 views
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'...
0
votes
0answers
28 views
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 &...
2
votes
1answer
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 ...
1
vote
1answer
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 ...
0
votes
0answers
14 views
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 ...
0
votes
0answers
7 views
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 ...
1
vote
2answers
66 views
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:
...
1
vote
0answers
67 views
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 ...
0
votes
1answer
94 views
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:
...
0
votes
0answers
67 views
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 ...
2
votes
1answer
58 views
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 ...
16
votes
3answers
3k views
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 ...
3
votes
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?
1
vote
0answers
45 views
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 ...
0
votes
1answer
29 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 ...
0
votes
1answer
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 ...
