Questions tagged [cooccurrence]

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21 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: ...
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0answers
26 views

Calculating probability of co-occurence

This is probably asked again but I wasn't sure what keywords to use to find these, so feel free to mark it as 'already answered' Let's take this simple matrix: ...
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1answer
108 views

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 ...
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12 views

Sparsity issue in co-occurance matrix

I am a noob in NLP. I am trying to put together a matrix for the occurrence count for pair of special characters in each paper. The special characters are defined in a list. I will have some special ...
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57 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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2answers
130 views

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

I hope this is the right place to ask this question. I have an algorithm that outputs gray scale images (not normalized). These images oftentimes contain a lot of random noise and sometimes ...
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1answer
167 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 ...
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1answer
111 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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1answer
41 views

“Normalising” join probability of n events, by taking n-th root

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 ...
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0answers
446 views

Cross Co-occurrence between two corpora

I've looked around for a solution to this problem specifically in nltk, quite a bit but couldn't find much help either on SO or elsewhere. My problem is as follows: I have a set of aligned pairs of ...