# Questions tagged [jaccard-similarity]

Jaccard similarity (or jaccard coefficient) is a similarity function for computing the similarity between two sets

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### How do these different expressions of the Jaccard similarity coefficient relate?

I am aware the Jaccard similarity coefficient, $J$, is classically defined as the cardinality of the intersection divided by the cardinality of the union of two sets, $A$ and $B$. I can easily ...
38 views

### Is there a better alternative for the Jaccard index to obtain the relationship between binary indices?

I currently have data from $n$ sources. Each source sends a binary signal each minute. I have a register of $p$ minutes. I have used Python to calculate the Jaccard indices of each signal as ...
13 views

### Drawing the correct card from a deck

Saw this on an old western show. A poker player believes the dealer is switching decks of cards. The player has 5 cards in his hand and at the end of a hand, he smudges all of them with cigar ashes. ...
1 vote
65 views

### Recommender system - for single user

I am building a recommender system, in which for one system there will be only one user. So we cannot use something like user-user data. Recommendation is an item which contains 10-15 attributes ie ...
105 views

### How to calculate the Jaccard index of co-occurence matrix without diagonal values?

I transformed a 2-mode matrix into a 1-mode co-occurence matrix and canceled all the values on the diagonal (because I thought it was meaningless). I wanted to use the jaccard method to calculate the ...
290 views

### Intersection over union vs sensitivity

In the context of segmentation, what is the difference between IoU and sensitivity? It sounds to me like they describe the same formula in different contexts but I might be wrong. When true ...
1 vote
207 views

### Accounting for 0 observations in presence/absence community data, PCoA/PCA: is this idea credible?

I have a solution in mind for this problem, but I'm not sure if it is defensible (which is why I'm asking you all!). I have a data frame where each row represents an individual site, each column ...
1 vote
249 views

### How to calculate euclidian distance from similarity matrix

I have a similarity matrix but can not use it in the k-mean as input. So is there any way to convert the similarity matrix to the euclidean distance matrix? Edit: I have Jaccard, overlap, cosine,(...
1 vote
340 views

### About LSH (Locality-sensitive Hashing) and MinHashing implementation using jaccard

I'm trying to implement this paper Browser Fingerprint Coding Methods Increasing the Effectiveness of User Identification in the Web Traffic I got a couple of questions about the LHS algorithm in ...
134 views

### Is the Bray-Curtis dissimilarity/similarity independent of richness/diversity?

I was told about potential issues with the Bray-Curtis dissimilarity/similarity measure. Specifically, I have been asked if Bray-Curtis is independent of richness/diversity. I am unsure how to answer ...
1 vote
13 views

### Clustering of individuals based on their time spent at various points of interest

Consider a set of individuals, denoted by $\mathcal{I}$, and a set of points of interest (POIs), denoted by $\mathcal{J}$ (with $|\mathcal{I} | \approx 10^4$ and $|\mathcal{J} | \leq 50$). For each ...
1 vote
114 views

### How to determine agreement between two sets?

I have two sets of Ids both drawn from the same background. I'd like to know the appropriate way to compare their similarity. Set A and B are often significantly different in length eg. ...
1k views

### Are Jaccard score and F1 score monotonically related?

I have compared the rankings obtained by comparing 10+ classifiers with this two metrics: Jaccard score F1 score They show a perfect correlation. This results holds on 50+ datasets. When comparing ...
1 vote
21 views

### Clustering - Distance Metric for Comparing Short Lists of Terms (non-repeating, no frequency)

Clustering involves using some distance or similarity metric. What is the best way to score the similarity of these small sets of words? Criteria: These are technical terms which are extracted from ...
586 views

### String distance equations for fuzzy-matching person names

A reproducible example with a small bit of R code is available in this stackoverflow post (link so I dont need to re-type out the code). The fuzzytext library in R ...
4k views

### Is Jaccard similarity/distance suitable for non-binary, quantitative data?

I have a dataset with each row a country and 10 columns with numerical features like GDP,Electrcity consumption, GNI etc. I am trying to use distance metrics to find similarity between the countries ...
643 views

### Difference between an interaction and combining two variables into one with a similarity measure?

Conceptually, what would be the difference between interacting two variables in a regression and combining these two variables into one via a similarity measure? I'm looking at top managers and boards ...
475 views

### Jaccard/binary (dis)similarity calculation to multidimensional scaling analysis

I have n N x n dataset of features (n) and subjects (N) in which I am attempting to cluster into a lower-dimensional space via multi-dimensional scaling. I'm confused about which MDS setup I need to ...
201 views

### Is there a way calculate a gradient of dissimilarity across multiple sites using presence/absence data?

I’ve been trying to come up with a metric for species (dis)similarity for fish in a series based on presence or absence data that gives a value of 1 or 0 for each lake. From my research, it seems like ...
310 views

### How to create a "similarity index" on a set of variables

I have a set of 12 variables that describe the dwelling characteristics. 10 of them are dummies (i.e questions like "does the dwelling have a bath?" or "is there crime in the area?"), while one is a 4-...
64 views

### distance metric for student course schedules

I'm doing an exploratory clustering analysis of student course schedules at a college. Interpretability by humans is paramount: we're trying to inform future research questions and possibly ...
1 vote
864 views

### Jaccard Similarity with Binary Data

I have 5400 rows of data and 3211 columns of attributes. The first 4 columns are ID/Name/ParentID/ObjectType - the rest of the 3207 columns are the attributes that are to be used for similarity ...
252 views

### jaccard distance if one samples is a subset

I have a very basic question but I cannot find an answer (especially for a clustering situation). I am trying to do hierarchical clustering of samples using jaccard distances. One sample contains ...
1 vote
146 views

### Addressing "Unbalanced Features" or Feature Taxonomy for Nearest Neighbor / Similarity Calculations

The main question is how to address an imbalance in representation of feature "sets" when calculating similarity. I'll motivate with an example scenario: Suppose we have objects described by a binary ...
141 views

### Unique Jaccardian Distance?

Hi I have a dataset that could be simulated using: ...
4k views

### Can I use Manhattan distance on binary data for hierarchical clustering?

I understand that classically Jaccard and Hamming work best with binary data, but is there anything specifically wrong with using a Manhattan distance instead with the complete linkage function?
816 views

### Estimate Jaccard similarity based on a sample

The Jaccard similarity of two sets, $A$ and $B$, is defined as: $Jaccard(A,B)=\frac{A\cap{B}}{A\cup{B}}$. Say that I only have a sample of $P\%$ of each of the sets: $A'$ and $B'$. What would be a ...
393 views

### Measure similar to Jaccard index but comparing more than two groups at a time

I am interested in looking at the amount of sharing between several samples (each represented as a vector of character strings), and to do pairwise comparisions, I have been using Jaccard indices. Is ...
1 vote
7k views

### Calculating Jaccard similarity in R: all duo combinations for multiple groups and creating a matrix or cluster plotting with the index [closed]

I have been trying to compute Jaccard similarity index for all possible duo combinations for 7 communities and to create a matrix, or preferably Cluster plotting with the similarity index. There are ...
1 vote
888 views

### How do I calculate the Jaccard distance for normal distributions?

I'm trying to replicate the results in this paper. I'm stuck at this part: specifically, calculate Jaccard intersection of pdata1 & pdata2 Is there some neat ...
2k views

### What is the significance of the Jaccard similarity score?

I understand how to calculate the jaccard similarity , but never quite understood the logic behind why are we calculating it. How does it show the similarity between two sets? What relation exactly ...
1 vote
103 views

### Correlation of continuous-time series

I have two continuous time series of discrete events. The data from them are timestamps of occurences, e.g. ...
1 vote
273 views

### Measuring similarity of observations (non numeric)

I have a dataset of format : day,measurement1,measurement2 1,a,b 1,a,c 1,f,s 2,a,b 2,a,c 2,f,g 3,a,d 3,a,q 3,f,s In this example day1 is more similar with day2 ...
381 views

### Calculating Similarity between two multiset

I need to find similarity between two multiset. For example, $$A = \{a, a, b, c, d\}$$ $$B = \{a, b, b, d\}$$ I know that I can use Jaccard Index but it gives same weight for each element. As ...
1 vote
600 views

### Dummy data clustering: OK to apply Euclidian distance hierarchical clustering on Jaccard similarity matrix?

I created dummy variables (binary data) from categorical variables where I want to partition N subjects into multiple classes by some clustering method. I created a Jaccard similarity index matrix for ...
129 views

### Similarity between bar plots (counts of categories)?

What are the best ways to compare (calculate similarity) between two bar plots? For example: ...
8k views

1 vote
102 views

### How to statistically validate that one clustering technique is more effective than other on Binary data

Problem statement - Idea is to cluster students based on their assessment pattern and score. Data = I have a data set that contains Binary data of students answers(Correct/incorrect) which i have ...
64 views

### How to form clusters when features are sets of string objects

I am building a movie recommender. But unlike common recommender from movielens data, features of my movies are sets like actor list, genre list, list of producers and writers etc. I know I can use ...
1 vote
584 views

### Detecting misclassified data points using distance matrix

I have a data set of around 65,000 items from a public database that have each been assigned to one of around 1,800 classes, but unfortunately I am aware that quite a few are misclassified. My goals ...
4k views

### Jaccard similarity coefficient vs. Point-wise mutual information coefficient

Can you explain the difference between the Jaccard similarity coefficient and the pointwise mutual information (PMI) measure? It would be great if you could add a few examples.
14k views

### Accuracy vs Jaccard for multiclass problem

TL;DR For a multiclass problem, is Jaccard score the same as accuracy? Update March 29, 2019 The wrong implementation in scikit-learn is now fixed with pull request #13151. Hooray! P.S. The lesson ...
1 vote
199 views

### Threshold value for nodes similarity

I am working on an algorithm for community detection on complex systems, where those systems are modeled as graphs. To form community i need to find similarity between nodes. I am using Jaccard ...
534 views

### Jaccard coefficient (0011 and 1100 most similar?)

I try to compare different binary objects, lets say: ...
3k views

### How to compare a Ranked List?

I have 50 products. For each product, I identify 3 related products (1 top related, 2 (partially related, least related)) using similarity measures. I want to compare the ranked list generated by my ...
1 vote
1k views

### Jaccard similarity of sets with approximate element matching

Consider two sets like this: A = {'hello', 'world'} and B = {'Hello', 'helo', 'goodbye'}. I want to measure the similarity between these two sets. There are two levels to this problem: Comparing ...
4k views

### NMDS from Jaccard and Bray-Curtis identical. Is that a bad thing?

The dataset is ecological (species abundance), where I am calculating distances between 51 sampling sites, based on abundances of 3200 species. The species abundance values go up to 2700, and the rest ...