Questions tagged [fuzzy]

Refers to generalizations of various concepts from binary (either 0 or 1) to continuous (from 0 to 1). Use this tag for all fuzzy concepts, such as fuzzy sets, fuzzy clustering, fuzzy logic, etc.

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Error with Fuzzy Tree model in Matlab [closed]

I create a fuzzy tree (aggregated structure) in Matlab and I have an error which I hope to be supported. My fuzzy tree has 3 fuzzy models (fis1, fis2, fis3). fis1 is the tipper1 and it has 2 inputs: ...
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1answer
34 views

How to fill the missing time series data?

I am currently working on the COVID data of a US state to predict the number of people affected per day and also the number of patients is hospitalized per day by developing the Fuzzy Mamdani Model ...
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9 views

Fuzzy Augmentation and Logistic Regression: Percentage Dependent variable

Let's say the dependent variable is 1 = Good and 0 = Bad. Using Fuzzy Augmentation, I obtained an observation with a dependent variable of 0.6. Is using Logistic regression with more than "2"...
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6 views

Regression with a fuzzy nominal predictor

I am looking at count + offset (rate) data that can be grouped into historical periods, but the borders between the periods are fuzzy, as in the specific year that delineates one period from another ...
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7 views

Creating crisp and fuzzy intervals for fuzzy clustering

In the course of my master thesis, I use different cluster methods to form customer typologies. Among others, I would like to use Fuzzy c means. For this, I should convert numerical variables into ...
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8 views

Integrated AHP and Fuzzy logic for Supplier categorization

I am looking into a supplier classification problem. As I have a lot of vague and subjective criteria I am using Fuzzy Logic to classify suppliers on two dimensions. However not all criteria are ...
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25 views

fuzzy hierarchical clustering

From the Fuzzy C-Means point of view: Every data point belongs to all the cluster which is given by their degree of membership to each cluster. How do I view it in the case of Hierarchical Clustering?...
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25 views

Interpreting cluster centroids Fuzzy c Means

I have a record of shopping basket cancellers from an online shop. My goal is to assign consumer behavior of shopping cart dropouts to clusters. My variables are: Number of shopping carts, number of ...
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5 views

Are grey relational analysis and fuzzy techniques 'the same'?

I am reading up on grey relational analysis proposed first by Deng Julong in 1985 (Introduction to Grey System theory) and on fuzzy sets/fuzzy mathematics. I interpret them as the same, since they ...
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15 views

calculating weights for weighted product model

I'm doing a fuzzy matching on accounts and have their name, date of birth and citizenship as additional factors. I am first evaluating the jarowinkler score of 2 names and if it is above a threshold ...
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1answer
40 views

How to apply fuzzy membership function to binary images?

I'm implementing this paper "Neural Network-Based Edge Detection for Automated Medical Diagnosis by Lu et al" and it says it uses a fuzzy membership function to improve its generalization accuracy. ...
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53 views

what`s the name or meaning of this clustering algorithm?

I have been learning the fuzzy clstering algorithm recently,and I got an object function as following: \begin{array}{l} \min \;\;J = \sum\limits_{i = 1}^N {\sum\limits_{k = 1}^K {\sum\limits_{j = 1}^...
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2answers
855 views

What ever happened to Fuzzy Logic?

Fuzzy logic seemed like an active area of research in machine learning and data mining back when I was in grad school (early 2000s). Fuzzy inference systems, fuzzy c-means, fuzzy versions of the ...
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1k views

2SLS Estimation for a Fuzzy Regression Discontinuity Design

I am using a Fuzzy Regression Discontinuity Design for the first time and this maybe a very basic question to some. I am estimating the Fuzzy RD with 2SLS. Suppose, my data is of the following form: ...
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751 views

Interaction Term in Fuzzy RD

I'm hoping someone can help me understand the intuition behind the interaction term in a fuzzy RD model. The setup is as follows: $x$ = rating variable with discontinuity at $x = k$ $D$ = dummy=1 if ...
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41 views

fuzzy rule extraction using fuzzy c-means

I have read an article which is about implementing classification methods using fuzzy-inference. It has used c-means, in one of its parts, for extracting fuzzy-rules. It says we have a fuzzy-rule ...
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1answer
92 views

Comparing the performance of a fuzzy model and a probabilistic classifier

For a binary classification task, I have (1) a fuzzy model (Mamdani) that outputs a number between 0 and 20 (after defuzzification) and (2) a logistic regression that outputs a number between 0 and 1. ...
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56 views

Can fuzzy numbers be used to propagate uncertainty?

I don't know if this is the right forum to ask this, but I'm currently reviewing a paper that uses arithmetic on fuzzy numbers to propagate uncertainty. As I understand the authors, they claim that ...
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2answers
750 views

Intercoder reliability without mutually-exclusive codes

I have the results from qualitatively coding the contents of ~100 images, with 7 categories and 96 tags in total. It's incredibly difficult to define mutually exclusive codes for the content we're ...
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1answer
28 views

Is there any practical situation where the response variable of a poisson regression is fuzzy

In certain models like a logistic model; fuzzy responses can occur. We may have suspicion in determining the state of the response variable (0 or 1) and therefore, cannot categorize the individual ...
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666 views

Fuzzy RDD in Stata with two cutoff points

I am running a Fuzzy Regression Discontinuity Design using 2SLS. If I specified the model (and most importantly the IVs) correctly as i have never worked on a RDD before. The difference to the usual ...
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1answer
130 views

what distance measure use for fuzzy c means clustering

How many distance measure that can be use for fuzzy C-means clustering ?
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1answer
62 views

Find the best matching element from a bunch of questions [closed]

First, I am sorry I have poor knowledge of math and statistics (but willing to learn). So it could contain non-sense and I would be glad to precise my thought. Here is the thing; I will have elements ...
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1answer
961 views

Algorithm recommendation: Short string classification/matching (fuzzy string matching or machine learning ?)

I have a product categories tree with names like apparel, jeans, beauty & wellness etc. ...
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52 views

IoT - Sensor Fault Detection and Isolation Techniques using Fuzzy-Model

Im working on a project which use fuzzy-model based fault detection and isolation technique to detect and diagnose possible fault occurrence on multiple types of sensor. I got stuck with the scheme of ...
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110 views

What type of data is causing the zero Sigma in Anfis?

I find this paragraph in "Intelligent Systems and Applications: Extended and Selected Results from the ..." book that discarded some data from dataset because they were not acceptable by the MATLAB ...
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50 views

Can inferencing come from incomplete rule sets?

I have some data for medical diagnosis, consisting of some rules about relationship of diseases and their symptoms, for example disease D1 frequently has symptom S1 ...
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153 views

FIS with k-fold cross validation?

I want to measure the fuzzy system performances directly through cross-validation. How can I do this? How the concept of training to get model and test the model?
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1answer
200 views

Feature Selection using Fuzzy Logic

I would like to know, Is it possible to do dimensionality reduction/ feature selection using Fuzzy logic ? If so, how does it work ?. Advance thanks for the help.
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1answer
105 views

Event similarity based on probability distance measure

Hеllо еvеrybоdy! It became interesting to me to code the following case: I have some spatio temporal events, and they have uncertain boundaries (for example "John visited England in April" and "Harry ...
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2answers
69 views

How to estimate daily spam rate from random hourly sampling?

Problem at hand: I need to compute daily ratio of spam vs non spam emails by sampling N number of emails per unit of time. In other words, instead of collecting all emails and sorting them, I would ...
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95 views

Is it possible to summarize unordered daily observations of counts in multiple time series?

I have a database of items, each of which is associated with one or more daily unordered time series; one time series for each source it's available from on a given day. Each observation in the ...
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1answer
175 views

Probabilistically-weighted variance

How do I calculate a statistic for one mixture component? My samples are drawn from a distribution which is an additive mixture of two overlapping component distributions. Given a probabilistic ...
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1answer
160 views

Fuzzy logic and Artificial Intelligence

Is it correct to classify fuzzy logic under Artificial Intelligence i.e. can fuzzy logic be considered a concept under the purview of of AI. If not how can we classify fuzzy logic.
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78 views

Fuzzy logic control model

I'm new in fuzzy logic modeling. I'm using the package "sets" in R. Starting form a database of crisps variables of 8 input varialbes and 1 output variable, I performed the fuzzyfication and I ...
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1answer
713 views

Initializing Fuzzy C means clustering

I have been performing fuzzy c means clustering using Matlab toolbox for my clustering problem. Unfortunately it leads to unstable performance since the selection of parameter membership (Uij) is ...
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1answer
688 views

ANFIS with cross-validation?

Can I use cross-validation k-fold for making FIS and optimization it with ANFIS or ANFIS itself has cross-validation? First my data was divided into two group randomly. One for making model and other ...
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108 views

correlation between attributes in fuzzy dataset

I am new in this field. I want to ask if it is any simple way how to measure correlation between two attributes in data set. Data are defined by fuzzy logic. I have own implementation of fuzzy ...
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452 views

How to do postal addresses fuzzy matching?

I would like to know how to match postal addresses when their format differ or when one of them is mispelled. So far I've found different solutions but I think that they are quite old and not very ...
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1answer
1k views

How to improve the performance of svm by using fuzzy membership function in R?

According to Lin and Wang, 2002, fuzzy support vector machine gives good performance on reducing the effects of outliers and significantly improves the classification accuracy and generalization. ...
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1answer
233 views

Statistical test whether to use Sharp or Fuzzy Regression Discontinuity Design

Is there a statistical test that would allow me to test whether I should use a sharp or fuzzy regression discontinuity design? Intuitively, I can think of two decision rules: (i) Test whether the ...
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337 views

Fuzzy Clustering Evaluation Metrics

I have a corpus of text documents which I am clustering using LDA & C-Means. I am trying to find the best input for the LDA algorithm (stemming, stop words removed etc), and I want to evaluate the ...
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48 views

How do I estimate the acceptable range?

I need to classify candidates as "good" or "bad" where a "good" candidate's age and income, say, must fall within some ranges; I'm trying to discover the boundaries for those ranges. A candidate must ...
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143 views

Alternative Optimization, Picard Iterations and Fuzzy C-Means (FCM) objective function

Question In Bezdek's [1] treatment of FCM (details below) after setting up the model and explaining you can't solve it directly/with usual gradient methods, he then says he uses Picard's method to ...
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699 views

How can I solve this classification problem?

I working with R on a classification problem. My outcome variable is binary with two levels 1 and 2. First of all I tried the logistic regression, which of all methods has the best performance, ...
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1answer
866 views

Testing Clustering Variables

I have two clusters. Those two clusters were obtained using Fuzzy C-Means with 8 variables. I'd like to know which variables have important role in differentiating the two clusters. Can I use t test ...
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1answer
70 views

Analysing the spread of data of a variable

In my data set there are repeated measures where each subject is measured at three time points.I want to see how the data of a single variable is spread.That is to find groups so that I can categorize ...
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34 views

Test for participant subgroups in gradual means shift

In an experiment with 44 participants I have measured the response time for a set of stimuli, where the response could be a or b. The means of the two responses do not differ significantly (783.3 vs ...
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1answer
98 views

Degree of belief in fuzzy modelling

I’ was reading a paper on fuzzy regression. In that paper, and many other papers on fuzzy regression, the authors use most of the time a $h$ to indicate a certain degree of belief. Unfortunately the ...
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1answer
11k views

Fuzzy RDD issue

I am fairly new to econometrics and maybe this is a very basic question to some. I am running a Fuzzy Regression Discontinuity (RD) design in Stata and I am having doubts about whether I am ...