# Questions tagged [cooccurrence]

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### Co-occurrence matrix factorization ALS

Let's say I have an item-item co-occurrence matrix that I want to factorize. I'll thus only have item factors. Is it possible to learn the factors using ALS ? I can't see how given that we'd have to ...
62 views

### How to compute Mutual Information

I am absolutely new to MI (and just really bad at it too!) and was wondering if someone could explain to me how to resolve this question. "Say word A occurs once per 1'000 words (i.e, Freq. (A)=0,...
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### Accuracy of PMI (Pointwise Mutual Information) calculation from co-occurrence matrix

Background When calculate PMI or PPMI from a co-occurrence matrix (COM), it sums each row (co-occurrences) of the COM e.g. 2 for pineapple as in the formula in the snapshot. For this question, it is ...
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1 vote
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### Best way to visualize which few data points out of many occur together frequently

Problem statement I am trying to construct a model that predicts stock price volatility on a given day based on data points represented as strings that may or may not be present on that day. My ...
60 views

### Measure like relative frequency that also weights the total [closed]

Background I see a lot of publications mentioning relative frequencies to indicate the presence of certain genes in a specific area. For example: ...
• 753
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### Fisher exact test for mutation co-occurence

I've a dataset of 492 samples, for each sample I've information regarding if gene X has a germline mutation and a somatic mutation. I would like to test co-occurence of germline and somatic mutation ...
191 views

### Comparing species correlations between species in two habitats

I have two community data sets (samples as rows, species as columns, populated with abundance). This data comes from two habitats/sites, with differing numbers of samples at each site. What I want ...
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1 vote
1k views

### Entropy or co-occurrence matrix to compute the randomness of gray scale images?

I have an algorithm that outputs gray scale images (not normalized). These images often contain a lot of random noise and sometimes also contain spatial structures. I would like to have some kind of ...
• 659
1 vote
786 views

### Correlation Test for Non-Mutually-Exclusive Categorical Data

I have a table of 288 rows and 4 columns where each row corresponds to a tumour sample, and each column is a gene. All of the values are 0 or 1, to indicate whether there's a mutation in a particular ...
155 views

### Why the two conditional entropy are not comparable?

I am learning the basics of text mining. For finding the syntagmatic relations in the text like the word "technology" occurs whenever the word "information" occurs i.e co-occurrence of words "...
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I have a group of events which I guess you could call a compound events. Each event is something like: $$A=A_1\cap A_2\cap...\cap A_{n_a}$$ I am estimating the probability of the over all event by ...