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

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Compare differences in dependent frequencies

I would like to compare two error rates (proportion of incorrect answers in questions with dichotomous response-format) for two different items, and I am looking for some advice on how to do that. ...
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7 views

Counting how many times some query parameters occur together

My web site logs which criteria was given by each search query. A typical line in this log file looks like x=foo&y=bar&z=baz, which means the user provided ...
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4 views

OOV “frequency”

I'm writing an algorithm to split twitter hashtags into their component words. I'm splitting the tags into all possible substrings, and then looking up each substring's frequency in a dictionary. I ...
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26 views

Time series: What is my natural time period?

We are modeling univariate ts with R. Sampled daily since 1-1-2013 at five observations per week. We are unclear about how to decide 'natural time period'. Until now we just assumed 260 weekdays in ...
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29 views

Standard Deviation and Variance

Can someone help me with this question because I'm not sure of how to do it exactly: There are two routes for a worker to get to his office. Both the routes involve hold ups due to traffic ...
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1answer
25 views

Frequency distribution and number of samples

Suppose I have a frequency distribution of some process of f_n(x) that is based on n samples, with ...
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37 views

Data structure for Inverse Cumulative Distribution when columns are *NOT* separate variables

I am trying to structure data to conduct a Frequency analysis and output an Inverse Cumulative Distribution histogram for a biomechanics study. The goal is to compare 4 devices with respect to their ...
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19 views

Mean in Cumulative frequencies distribution

Monthly expense Cumulative Freq. up to 50 7 up to 80 25 up to 120 49 up to 200 58 over 200 60 Calculate ...
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1answer
37 views

Probability distribution, unfair coin

An unfair coin which has 0.35 probability to result head is tossed four times. Build and represent graphically the probability distribution and the cumulative ...
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1answer
41 views

Variance and asymmetry on relative frequency class distribution

I don't know how to resolve this (easy) exercise. I've calculated the first output. But I don't know if it's correct. Calculate arithmetic mean, variance (standard deviation^2), concentration and ...
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1answer
16 views

What test(s) can I use to compare 4 percentages for both pre- and post-treatment conditions?

Have 4 groups of results from 4 different treatments. Want to compare pre- and post treatment within groups and between groups
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1answer
53 views

How to test for correlation between frequency of an event and the stock market

I am currently running an event study, for which I need to find out if my events are clustered and/or if their frequency is tied to the stock market. Creating a scatter plot of the event dates and the ...
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1answer
49 views

Difference in frequencies in two groups of unequal size

I want to compare the frequency of retweets between 2 groups of unequal size. I've got the total tweet count and the retweet count for each user. I was hoping the R Cookbook webpage would help but the ...
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1answer
71 views

Most significantly frequent category

I am measuring the frequency of consonants in a sample lexicon of a language. The results are as follows: ...
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2answers
134 views

Excel: which products are most frequently ordered together? (clustering question)

I'd like to recruit your help in coming up with an Excel-based method to analyse a set of raw ordering data where each item is on its own row. So, in the data below, order 111 contains two part ...
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1answer
65 views

What are the chances of something *not* occurring?

Suppose I'm gambling using a strategy of doubling my bet whenever I lose to recoup my losses from previous bets. If my initial bet is 1/2048 of my capital, I can bet 10 times before I run out of ...
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0answers
24 views

Testing if a difference between two frequencies is different from zero

I have been trying to find the best way to test if the difference between two frequencies is significantly different from zero I have the following data: ...
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1answer
69 views

I have an easy Text mining frequency question

I have a very simple question. I am doing a simple frequency analysis where I am looking at two documents and comparing the frequency of the top used words in each document. I want to do a comparison ...
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1answer
66 views

How to compare frequency distributions

I have one categorical variable that can assume 5 possible values: 1, 2, 3, 4, 5. I observe the value of the variable in two samples of different size. Now I want to compare the frequency distribution ...
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0answers
8 views

Comparison of frequencies for several treatments in an incubation, with time zero sample not replicated

I have a list of seven samples from an incubation series with frequency of occurrence for, say, 30 species from each treatment. Typical observations within each bottle are >5000 (DNA sequences). ...
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0answers
45 views

Chi-square on a categorical variables (derived from continuous distribution)

We know that Chi-Square can be used with categorical data (such as Male/Female, Republican/Democrat, etc). However, I convert my original continuous data to ...
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0answers
66 views

How Can I predict the frequency of buying of a product

I'm trying to predict the frequency of buying a product based on their previous purchasing history. The approach I took as of now is, Create a vector by finding the duration distance of each ...
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0answers
31 views

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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0answers
25 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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0answers
26 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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1answer
181 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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27 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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1answer
80 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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44 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
149 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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0answers
91 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
57 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
67 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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122 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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0answers
321 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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0answers
41 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
10k 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
202 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
91 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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0answers
32 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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0answers
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
48 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
34 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
34 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
294 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
205 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
80 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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0answers
29 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
108 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 ...
3
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2answers
176 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 ...