Questions tagged [frequency]

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

Filter by
Sorted by
Tagged with
54
votes
7answers
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/...
3
votes
3answers
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 ...
35
votes
11answers
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 ...
6
votes
1answer
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 ...
2
votes
1answer
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....
4
votes
1answer
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 ...
2
votes
3answers
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: ...
7
votes
2answers
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 ...
2
votes
1answer
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? ...
4
votes
1answer
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 ...
4
votes
4answers
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 ...
1
vote
1answer
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 ...
1
vote
1answer
388 views

Comparing category distributions

I have categorical count data (for categories C1 to C3, but potentially several more categories) for two datasets: ...
0
votes
1answer
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 ...
0
votes
2answers
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 ...
4
votes
1answer
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 ...
3
votes
3answers
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: $00'$,...
3
votes
1answer
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 ...
2
votes
0answers
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 ...
1
vote
1answer
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 ...
1
vote
1answer
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 ...
0
votes
1answer
101 views

Finding an appropriate trend test

I have 50 years of rainfall data and it is categorised based on intensity over a region (eg:1-10mm/day, 11-20mm/day ect.). I want to test the trends in the frequencies of each category. Is Mann-...
0
votes
1answer
279 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: ...