# Questions tagged [frequency]

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

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28k views

### Period detection of a generic time series

This post is the continuation of another post related to a generic method for outlier detection in time series. Basically, at this point I'm interested in a robust way to discover the periodicity/...
3k 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 ...
110k 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 ...
4k views

### Chi-squared distribution for dice not returning expected values?

I'm trying to verify that my dice are reasonably fair and balanced. I'm not sure I'm doing it right, though, since I'm basically teaching myself stats without references. To achieve this, I've settled ...
301 views

### Variable frequency redistribution

I know that there is a way to "redistribute the frequencies of a variable" as stated here: Slide number 14 and 15 about redistribution and here: Dorian Pyle book chapter 7 section 2 paragraph 3 (7....
8k 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 ...
2k 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: ...
721 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 ...
4k 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? ...
10k 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 ...
365 views

### How to estimate a probability of an event to occur based on its count?

I have a generator of random symbols (single act of generation produces exactly one symbol). I know all the symbols that could be generated and for each symbols I would like to estimate the ...
401 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 ...
388 views

### Comparing category distributions

I have categorical count data (for categories C1 to C3, but potentially several more categories) for two datasets: ...
735 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 ...
492 views

### What is the frequency in my series and does it matter for my forecasting models (SARIMA)?

I am working on multiple time series consisting of various sensor outputs. I am having data for more than 3 months duration. I am supposed to find p,d,q orders and coefficient values using the latest ...
846 views

### Poisson Rate Regression: Offset? [duplicate]

I'm comparing two groups on the # of hospitalizations they have in a 5 year period. Length of hospitalization stay is highly variable. For example, a patient might have 3 hospitalizations that in ...
115 views

### Distribution of *conditional* frequencies when frequencies follow a Dirichlet distribution

Context: we have a large number of individuals characterized by two binary traits; call these $T$ with values $\{0,1\}$, and $T'$ with values $\{0',1'\}$. So there are four types of individuals: $00'$,...
997 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 ...
397 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 ...
3k views

### How to compare two samples of frequencies?

I am looking for statistical methods used to compare frequency of observations between two groups. suppose I have two groups of pigeons with the same sample sizes, say 10. The number of  red blood ...
6k views

### What is frequency in time series in general and in my examples?

I have 2 years day-wise data of stock price. What frequency I should take in this case for next 1 year day wise prediction? I have one day minute-wise data. What frequency I should take for next day ...