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

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statistical comparison of power spectrums over all frequencies

So I have N=147 control time-series signals and N=134 treatment (THC) signals. I want to compare if there are any significant differences in frequency power in the two groups. The top part of the ...
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21 views

How to check if a group is similar to another, in two different classifications

Suppose I have two different classification, e.g. C R s1 c1 r2 s2 c1 r2 s3 c3 r2 ... Where sn are the classified samples and the columns of the ...
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22 views

Question about the frequency definition of probability

In the book, it is written that the relative frequency or the frequency ratio gradually tends to become more or less constant as N becomes larger and larger. It is also mentioned that this is an ...
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Creating a table with individual trials from a frequency table in R (inverse of table function) [migrated]

I have a frequency table of data in a data.frame in R listing factor levels and counts of successes and failures. I would like to turn it from frequency table into ...
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47 views

Statistical comparison of two signals

I need to develop an algorithm that will compare two signals and generate some metric(s) to describe changes between them. Signal processing and analysis isn’t my strong point so I would appreciate ...
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25 views

Show that the Geometric Mean $g$ can be expressed as $\log g=a+\dfrac{k}{n}\sum_{i=1}^r f_i(i-1)$

In a frequency distribution the upper boundary of each class interval has a constant ratio to the lower boundary. Show that the Geometric Mean $g$ can be expressed as $$\log ...
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45 views

Compared results of 2 goodness-of-fit chi-square test

I am conducting Goodness-of-fit test on 2 cities using chi square. ...
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30 views

Compare Frequencies

I have a continuous predictor variable that I have divided into bins (at 0%, 0 to 25%, ...). For each of these bins, I have shown you the histogram below of Number of Companies that are in that range ...
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1answer
84 views

$\chi^2$ test of significance vs. goodness of fit

I have 644 companies out of which 154 went bankrupt. I investigate below if the bankruptcy is related to the sector type: ...
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29 views

How to measure the period of an oscillation with least error?

I have a question about analyzing the data from a coupled pendulum. I have measured the amplitude $\psi(t)$ which is expected to be a beat and I want to measure the period. The ideal plot would be ...
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1answer
33 views

Frequency Distribution Test Vs. Chi Square Goodness of FIt

I need to prove that the higher frequency of an occurrence within a particular range is statistically significant. Let me explain this with an example: X-axis has ages and Y-axis has the ...
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0answers
30 views

Frequency with repeated measures

I did an experiment in which I group objects based on machine learning. I then tested whether people group them in the same way. Each subject (I had 30 subjects) watches 8 sets of 3 objects. In each ...
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51 views

Keyword probabilities

I'm not a huge stats buff and am wondering what the best approach to my problem is. Say I have a list of PPC* keywords and if a desired action was taken. Let's say I put this data into two word ...
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76 views

What is the frequency of a time series for hourly data?

I am using R for time-series analysis and predictions, the package 'forecast' to be more precise. I am in a dilemma. I have hourly data that needs a prediction and needs to be analysed. I am using the ...
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18 views

Power Spectral Density

I'm currently writing an spectrogram to be able to plot Audio signals. So far, I have done the following: Split the data into blocks of 256 overlap of ...
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6answers
2k views

Mean absolute deviation vs. standard deviation

In the text book "New Comprehensive Mathematics for O Level" by Greer (1983), I see averaged deviation calculated like this: Sum up absolute differences between single values and the mean. Then ...
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1answer
70 views

Prevalence conversion to effect size in meta-analysis

I'm used to thinking about meta-analyses in terms of evaluating the impact of an IV on an outcome of interest (ex: relationship between a teacher's level of self-confidence and student outcomes), and ...
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1answer
83 views

Is it valid to apply large scale statistics to a single case?

I have a small black box that displays a 0 or a 1 every time I press its button. I can tell you, truthfully, that over the past 20,000,000,000 times it has been pressed, 19,999,999,990 times it has ...
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26 views

Comparing frequencies of 32 binary patterns among 5 different sets

I have the frequencies of binary patterns of polar and non-polar residues in strands of anti-parallel beta-hairpins from 5 different sets of anti-parallel beta-hairpins. I want to know how can I ...
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30 views

Combining Box Plot with frequency count [duplicate]

Are there graphing techniques (certain kinds of plots) that are similar to the Edward Tufte's box plots - shown below - but that consider the distribution of the data points? But instead of a black ...
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1answer
42 views

calculate the percentage of workers getting wages between $22$ and $58.$

I want to calculate the percentage of workers getting wages between $22$ and $58.$ I don't know what to use. Please help me. I've learned central tendency and interpolation. ...
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2answers
33 views

How many counts for good frequency estimate (binomial)?

This is a pretty basic question, I think, but I'm finding it difficult to locate an answer or decent treatment of it on the web. For a binary dataset (binomial) with some unknown parameter p ...
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0answers
30 views

Is there a better term for frequency distribution of a term frequency?

I am wondering if there is a better way of formulating this and also if this is a correct way of formulating it. What I'm trying to represent in the frequency distribution is the count of documents ...
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3answers
132 views

How to compare two samples of frequencies with categorical x values where one is subset of the other

I am trying to compare two arrays of frequencies. The second is a subset of the first. I want to know if the second is a representative of the first. The arrays are: ...
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1answer
112 views

How to form a frequency distribution table from different survey results

I have a survey I have conducted on a certain market to determine whether or not we should consider reentering that market. After conducting the survey I was hoping to draw some conclusions from this ...
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2answers
61 views

select words randomly in proportion to their frequencies

I have a large text and I need to select words randomly in proportion to their frequencies. A raw method is to put all the words in an array (N indexes) and to use a random (uniform) generator to ...
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24 views

which type of statistical analysis for survey of experts

I have a set of 33 questionnaires, each questionnaire has 4 responses, the purpose of analysis is to evlaute the existing flood management system in country, trend in response from 33 experts, and to ...
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1answer
87 views

Does Sampling Frequency matter for Time Series analysis?

I am given two time series of prices between 2009 and 2013. Price series A is weekly data, series B is monthly data. I would like to compare some basic descriptive statistics of these two time series ...
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2answers
142 views

How to figure out what numbers often appear together in a dataset?

I have a lottery style dataset we produce internally (example below). I am trying to figure out which numbers appear most frequently together. Example questions: What are the top 10 pair of numbers ...
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33 views

Panel data: IV with different frequencies

I would like to estimate a standard logit (panel data): $\text{logit}(P(y_{i,t}=1))= \alpha + \beta_1 x^1_{i,t} + \beta_2 x^2_{i,t} +\epsilon_{i,t}$. The problem I am facing, however, is that $x^2$ ...
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1answer
248 views

Frequency of time series in R

I have 10 minutes-intervaled wait-times data for a coffee shop for 4 weeks between 9am-5pm. I use R's ts for my analysis. What should be the frequency parameter? Is it (48=# of intervals per day) or ...
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266 views

Comparing frequency distributions using Mann-Whitney test

I have two frequency distributions; which each are frequency of an event. I would like to compare these distributions, and conclude that these events and conclude if these events are statistically 1 ...
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1answer
42 views

Comparing category distributions

I have categorical count data (for categories C1 to C3, but potentially several more categories) for two datasets: ...
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3answers
613 views

Comparing histograms

The data I have are the ages male or female won an award (79 data points, ages, for each gender). When constructing a freq table I used to find the number of classes, $$ n = 79 $$ $$ ...
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31 views

Generalization of skewness detection in non-uniform case

I am not sure if my title reflects what I am attempting to ask. Let me elaborate my question. I want to classify an observation/feature into one of two categories ($A$ and $B$) based on frequency of ...
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27 views

Statistical Analysis on Comments and Feedback

I have access to 10,000 comments for a mobile app, and I want to run some interesting statistical analysis on them. What I have done so far: Look at the frequency of each word in all the comments. ...
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1answer
97 views

How to associate daily rainfall probability with historic data

Given a rainfall forecast of d days ahead and historic data collected over y years, what's a simple (but correct) way to ...
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1answer
83 views

Goodness of fit using frequency tables with low counts

I have two frequency tables, one representing observed data and one representing modeled data. I am looking for a Goodness of Fit measure, checking whether the model data fits the observed data. ...
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1answer
57 views

Given a frequency distribution, calculate probability of A given B

My test recorded the number of times a variable reached a threshold value when a predetermined event occurred. Then, the test recorded the number of times the variable surpassed the threshold value by ...
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1answer
649 views

(Multiple) Correspondence Analysis for count data entered as binary variables

I have a data set, 1014 cases and 55 variables which are binary and is in the form of ...
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23 views

How to compare multiple (17) frequencies (as a “combined trait”) of different measured features between two groups

I have two groups of samples (A, n=100 and B, n=30). For each groups we measured whether a trait is present or absent in each sample (0 or 1), resulting in frequency of "ones" for each trait. This we ...
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37 views

How to determine significant differences between frequency spectra?

I want to determine whether the mean of frequency spectra are statistically different from each other. I have a set of trials in different drug conditions and I want to test whether a drug had an ...
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38 views

Frequency of data: is quarterly data better than half-year data? Why?

Hi have a dataset which I constructed using quarterly observations (from bank accounts). I could have also used half-year or yearly data, but I chose quarterly because I thought that higher frequency ...
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121 views

Chi-squared test vs gamma correlation coefficent

I have two 5-point Likert questions x and y. I want to test whether they are associated using the chi-squared test of independence. I summarized the responses into the following frequency table: ...
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125 views

Forecasting with large, high frequency dataset

I am doing my master's thesis and I must compare various forecasting techniques at different frequencies of datasets. I am using my universities dataset, the REDD dataset, UCI dataset and CER Ireland ...
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1answer
67 views

Frequency on Tbats function in R

I have 3 complete years + 4 weeks of weekly time series data, of which one of the years is a leap year. To calculate its frequency should I do (365x2+366)/(3*7)? Thanks!
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1answer
218 views

Normalizing Term Frequency for document clustering

I have a problem understanding the normalization of Term Frequency weight in document Vector Space Model for clustering. Let's say that for document d I have counted occurences of all terms. I ...
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1answer
78 views

Significance of most frequent answer

I have the following data: I have participants who answered on their favorite out of 6 positions of various information types on a display (e.g. 1 = bottom left, 2 = top left etc.). I can now say for ...
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16 views

Analyzing multifactorial frequency data

I have a dataset that is Y/N acceptance of a 2x2x2 set of devices, in three different groups. I'm unused to multifactorial frequency data and am not sure how best to go about analysing it (other that ...
3
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1answer
74 views

How to get a Standard Error for a Poisson Variable with Exposure?

I'm looking over some work performed by a consultancy and I'm unsure whether the standard error formula they have used is correct, and the subsequent conclusions they have drawn are erroneous. They ...