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

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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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23 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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113 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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2answers
39 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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7 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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10 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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17 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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45 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
57 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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40 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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22 views

Quantifying 1 factor count data with variable # of categories

I feel like this should be an easy question, but after lots of looking I"m stumped. I deal with continuous data almost exclusively, but in my infinite wisdom I designed this study that yielded ...
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24 views

Term importance from document with predefined weight

I am having a set of document with different value weight on them. I am trying to understand which term from the documents trigger the highest values. I have a theory on how to do it and I would like ...
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1answer
39 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 ...
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50 views

Is the frequency of one observation greater than the frequency of others

Suppose I have 10 bags of M&M's. I count the number of red, blue, green and brown M&M's in each bag. I want to know if there are more red M&M's than other M&M's in the bags and if this ...
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16 views

Frequency change monthly series

I have a monthly series and I want to make it quarterly. I want to know which method I use. I used an arithmetic average but I do not trust these results. There is a procedure in Stata and Eviews I ...
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Differences in variables constructed by counting.

I have constructed a frequency variable from counting events of certain magnitude (e.g, 1,2,3...) from a time dependent experiment with animals. I have two groups (Trained vs Control) and two phases ...
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22 views

Frequency analysis from time dependent data in R

I've got a time dependent data from animal recording. My data has two groups (TR and UT) each group has 20 replicate. Tiempo (time) variable goes from 282 sec to 318 sec. I have a turning point at 300 ...
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1answer
86 views

Calculating Mean and Standard Deviation From Frequency Chart

I have only a frequency table like that below. How can I get the mean and standard deviation? ...
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1answer
49 views

How to get corpus used for word-frequencies for languages other than english?

I have taken a corpus of English for finding the word frequency in giving recommendation for spelling mistakes. I just used simple : Edit Distance between ...
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31 views

Best statistical analysis method for frequency data

I'm designing a between subjects experiment with 1 dependent variable with 2 levels (manipulation & Control) and 4 dependent variables which are all categorical (Yes/No). I would like to see the ...
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32 views

Suggested algorithms for time series analysis of sporadic events

I have a series of sporadic, discrete time series events that appear to occur in shorter interval clusters and I am looking for a way to determine the frequencies at which the events occur. None of ...
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156 views

Frequency jump detection

It is generally known that 'jumps' in frequency data are difficult to estimate. In the current literature, many different techniques for estimating such jumps have been tested and often with ...
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92 views

What do you think is the right tooling to separate sub-time series from a single big time series?

I would like to separate a big time series into its components to improve forecasting. To clarify: I would like to find the different components - maybe it is better to say frequencies which ...
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121 views

Comparison of frequency rates

Patients with chronic schizophrenia will take some antipsychotic drug during some period of time. The frequency of schizophrenia for each patient will be recorded before and after that period. I ...
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176 views

Econometric Model and deciding the frequency of data collection

I am looking to build an econometric model and I am wondering if using annual data vs monthly or quarterly data is going to produce a less accurate model. If the dependent variable is affected by ...
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16 views

How to investigate higher frequency oscillation from lower frequency observations?

I have a set of data, e.g. chilled water flow rate, from a sensor reading, which record the value every half an hour. However, it yields irregular high-low pattern which bothers me quite much. Until ...
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1answer
40 views

Word-frequency and statistics

I am new to statistics and am wondering how I can apply it in linguistics. There is a conjunction in a corpus that 902 times (.91) conjoins sub-clausal units, and 91 (.09) times clausal units. How ...
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74 views

How to compare multiple frequency distributions with some zeroes?

I have a data frame with frequencies for the teacher profession descriptors as it is perceived by 1st year, 2nd year and MA students. Some of this frequencies are zeroes. What statistical method can I ...
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53 views

Variation on the urn problem and frequency distribution

I have $6$ machines each producing different coloured balls. The balls are mixed together in a large vessel. Groups of $6$ balls are extracted at random for packing. Each pack will therefore have a ...
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90 views

To BIN or not to BIN a continuous data to get a Fragment Size Distribution ?

I have a data set in excel of almost 6000 entries (quantitative and continuous => P(X=x)=0, I mean the possible values for my continuous random variable X are uncountably many). Each point will ...
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46 views

Comparing Frequency Distributions with non-categorical data

Rather than try and contrive things, I'll just give you the data as is. This similar to the ideas found here. I have two population from a control group and a disease infected group. I want to ...
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1answer
31 views

How to compare groups with different sizes?

I need to calculate the winner of a PTA membership contest for our local elementary school. There are 15 classes of different sizes (size based on number of students in the class). We need to see ...
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1answer
42 views

Principled way of combining time series with different spans and granularity into an econometric model

I want to forecast the price of something given various time series as inputs. The problem is that they are of different frequency (annual, quarterly, monthly, daily) and time periods (the more ...
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109 views

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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8 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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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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41 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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44 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
44 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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68 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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24 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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58 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
271 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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26 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
109 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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87 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
79 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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279 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 ...