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

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Percentile rank for list of event freqencies.

I have a global list of event frequencies and then another list of local event frequencies for another population of the same type. The objective is to compare the local frequencies with the global ...
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18 views

Arithmetic Mean for a Frequency Distrubition [closed]

The following frequency distribution shows, for a random sample of 150 retirees, the time spent each day surfing the net. Daily usage (minutes) 10-30 30-50 50-70 70-90 ...
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Can I Use DFT To Find The Most Common Frequency?

I have a collection of data which measures the change in state of a device which records information. I basically record the time a new observation is made on the device. I want to collect the data ...
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19 views

How do I conduct a comparison of two 6x4 frequency tables that hold different data?

I am trying to statistically compare two frequency tables (6x4) of two independent samples (see picture for example of one group's table). What would be the best way to evaluate whether these ...
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14 views

Using frequency tables to judge similarity

I'm a newbie to data mining, and attempting to simplify a problem. Assume I want to find out what skills make up a certain profession. So I'll ask the user to input their profession, followed by a ...
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8 views

what should take frequency for Daily Summarizes Transaction data.

I am little confuse about to take a frequency for time series data on daily transaction data in ts() function. I have 2 years of Daily Transaction data (Means How many amount withdrawal in a day ...
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76 views

Correlation between monthly and quarterly data

Does anybody know how to measure the correlation between monthly and quarterly data? I would like to calculate the correlation between ISM PMI (monthly) and Real GDP growth (quarterly). So, the 2 ...
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26 views

Enrichment of mutations in particular region of the gene

I have a gene say "X" of 3000 base pairs. 300 of those 3000 bp belong to ring domain. Rest 2700 do not belong to ring domain. In a particular tumor, the ring region has 4 alterations and the rest of ...
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183 views

Why do small sample sizes give more significant p-values for rare events?

Maybe I'm getting a bit confused, but I have a single binomial variable with very low frequency (e.g. 1 event in 100,000 trials), and I'm trying to figure out what sample size is required to show a ...
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25 views

How can I use inputs of lower frequencies to predict an output of higher frequency?

I would like to use a NARX or a LSTM to use different type of data at different frequencies -for instance weekly, monthly and quarterly- to predict data sampled at a higher frequency -in my case, ...
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15 views

likert scale analysis

i have 34 types of accounting violations, and i want to know which violations can be considered as a fraud, i asked this question to experts by using likert scale questioner, the answers are strongly ...
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11 views

how to represent MLB games as time series

I have been requested to predict National league(NL) OPS (to start with) for the coming season and compare to a given team predictions to be able to evaluate a chanse of winning a certain number of ...
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10 views

Find high occurring low values

In numerical data, where outlier is defined not by infrequency but value (this is a real-world data-set where low values would be indicative of noise). Although this is real world data, there is no ...
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3 views

inequal amplitudes and opened classes

i have to questions and i need the help of experts 1)In the case of inequal amplitudes, is the sum of the corrected frequencies is equal to unit? 2)In the case where the extreme classes are opened , ...
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11 views

VAR model for variables of different frequencies

I am trying to capture the transmission of monetary policy in India. I am willing to take into account the effect of Non Performing Assets (NPAs) on the transmission from the policy rate to bank ...
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93 views

Estimating the distribution of frequencies from a sampling of unique values

Let $L$ be a list of elements with repetitions, and $S$ be the set of elements appearing in $L$. I have two tools at my disposal: I have a sample of $k$ elements taken uniformly in $S$, and for each ...
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326 views

Why does multiplication in the frequency domain equal convolution in the time domain?

This question came in the context of understanding how to get a distribution of a sum of two iid random variables. I'm working through the top answer to this question Consider the sum of $n$ uniform ...
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9 views

test significance for frequencies

I have frequency data for six datasets (3 control samples and 3 treated samples) consisting of values for physical stiffness, when I plot the frequencies against stiffness it looks like the treated ...
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1answer
38 views

Why 'Assumption of Uniformity' for Mean?

I am teaching some very basic statistics for grouped data. In a different class a few years ago I made an 'assumption of uniformity' about the data: within bins, data is uniformly distributed ...
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45 views

How to calculate a mean of a sample where some measurements do not match a normal distribution?

I have a set of temperature measurements from amateur meteo stations around the place I live in. Being amateur meteo stations, the measurements vary because of the placement of the probe, measurement ...
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1answer
21 views

Can a value appearing more frequently for a class help predict it?

I am trying to analyse my data before doing multi-class classification with SVM. I have several variables. I pick one of them and study it. This is a categorical variable. It can have the value 0 or ...
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9 views

Frequency of phenotype based on probability of genotypes

I know that in genetics you never know the frequency of any trait, even if you know the probability of having that trait. For example I know that the probability of having A+ blood is = P(AA+/+) + ...
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6 views

how to estimate the loading factor for a travel company?

I am pretty naive to statistics, so please correct me where I am wrong. I am trying to estimate average case loading factor for travel company. This travel company is running shuttle service wherein ...
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56 views

Hypothesis testing: test difference in frequencies

I have sampled some data, and want to argue that one class of events is more common that another class of events. To get concrete, let's use an example involving text. Suppose I sample some English ...
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31 views

Analysis method for nominal dichotomous data from mixed design

I have the following data set (example): Subject Treatment-group Decision_x Decision_y Decision_z 1 1 A B A 2 1 B B ...
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64 views

Testing for top 3 options

I have data as shown in the chart below. There are 1144 rows of data and for each data row, an event (A, B, C, ..., I) could either have occurred or not occurred (that is, on or off; binary). For ...
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31 views

Expected frequency (per million words)

I'm trying to figure out what this paragraph means: The final measure was (like #2 and #3) designed to exclude discipline-specific and technical words. It states that the word cannot occur ...
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41 views

Calculating expected number of zero-crossings of a white noise process

I am curious about how to calculate the expected number of zero-crossings of a white noise process over some time $t$. In particular I would like to be able to deduce the expected frequency of ...
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53 views

Difference between samples in terms of frequency ranks

I have 3 different texts, and for each one of them, I have the frequencies of 25 letters appearing in those texts (Text A, letter A, freq = 5013; Text A, letter B, freq = 1462,...). These texts have ...
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28 views

Finding a representative upper limit of a large dataset

I have summer cumulative solar radiation data derived from a model on an area in North-West Italy. I extracted the modelled values from specific regions (i.e. within rock glaciers outlines), obtaining ...
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38 views

Cramer's V and word frequency

I am investigating the frequency of a word in two distinct corpora. In one corpus, it occurs 232 out of 189,489 times, and in the other corpus it occurs 4394 times out of 559,715 times. The result of ...
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61 views

Log vs. double normalizing of Term Frequency

In the wiki page on Term Frequency-Inverse Document Frequency (tf-idf) there are two interesting TF weights: Double normalization $K$: $K + (1-K)\frac{f_{t,d}}{\max_t f_{t,d}}$. In this question I ...
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60 views

Inference of frequency of values in a poisson distributed histogram

For some data there is a histogram, which has bins with varying sizes. Is it possible to infer the frequency of the values for smaller segments of the bins, favourably with Matlab? With the attached ...
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50 views

Poisson distribution vs Three-way table to Compare multiple incidences

I need some help understanding the difference between comparing incidences of rare events with a Poisson distribution and using a three-way contingency table. I'm sure I have some fundamental ...
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92 views

The frequency in histograms

My question is trivial, but the problem is that I found contradictory answers on internet. So I have the following sample data: ...
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34 views

Normalization of distributions

I am measuring intensities of structures in biological tissues, which gives a series of values for each sample. There is high variability between values for each samples from unknown procedural ...
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58 views

Assigning weights (or importance) based on frequency

Data I have prepared the data (67 dimensions) in the form of vectors like: 1,0,0,0....66 times 0 (just 1st dimension having ...
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9 views

Statistic way to find a threshold for NGrams occurrence

I got a vector of Bi-Grams with their occurrences, and I have to calculate tri-grams from the most occurrent bi-grams. Therefore I need to find a statistic way to find a threshold of big-grams ...
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Analyzing changes in the structure of (a) population(s) across time

I´d like to know how to compare populations of test takers taking an exam, in order to know whether there are significant changes in the structure of the group of test takers across several years. I ...
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93 views

chi-squared to test if two variables have the same frequency distribution

I want to test if x and y have the same frequency distributions using chi-squared. In my code below, I've concluded that because ...
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147 views

Am I breaking the assumptions of the Poisson distribution?

The Poisson distribution arises when events are counted within a specified interval. I've recorded the number of events each month (I'll not discuss what these events represent). This appears to meet ...
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135 views

Find the values between percentiles in a frequency distribution

In the distribution below, how would I find the values that lies between 30% and 50% of the distribution? R code would be handy but not essential! 28, 28, 29, 30, 30, 31, 31, 31, 31, 32, 32, 32, 34, ...
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Statistics question related to the Charleston shooting

Note: This will be a long post, and I apologize for that. There's been a lot of parsing of President Obama's words with regards to the "frequency" of shootings in other countries. I contend he's ...
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41 views

How to perform a filtering to get the low, middle and high frequency components of an image?

I am currently looking into some image processing project and just wondering how to obtain the low, middle and high frequency components of an image? For example, as this picture showed (I got it ...
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38 views

What are the criteria to choose for a bootstrapping, frequency, forecasting of fitting method to fit demand data?

My goal is to calculate the inventory height of several products. To do so, I have to calculate the probabillity a certain demand occurres. However to determine the distribution based on historical ...
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46 views

Cumulative distribution percentage in Lorenz curve

I have dental caries data based on two different indices. I have already calculated the logistic regression using binomial outcome for each of these indices. However we found that a portion of our ...
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144 views

Researching the frequency stability property

I have seen this short, wonderful video about the frequency stability property (also there is another video from this guy under his Kickstarter project ArtOfTheProblem; they are both great, and I ...
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2answers
78 views

Comparing frequencies

I'm trying to find the right test to use to compare 3 frequencies. Basically, in my research, 3 separate user interface prototypes were given to the same sample (10 people) and particular tasks needed ...
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102 views

Differing frequencies for time series ts() function in R

I understand the frequency argument of the ts function in R is set to work for monthly, quarterly, yearly data, etc. In my case, ...
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1answer
75 views

Which test? Chi-square, non-parametric or Poisson Regression..? What species is the most frequently observed

I'm reposting my question based on previous comments received. The problem: 10 x 100m sections of shoreline have been sampled to determine if one species is the most frequently observed species ...