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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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How to calculate accuracy of Mamdani fuzzy inference system?

I have make a Mamdani fuzzy system and know I want to test my 25% test data in that in MatLab, Firstly, I made c4.5 decision tree based on 75% of data then I extract the rules from them, and I import ...
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Placebo Thresholds in a Fuzzy Regression Discontinuity Design

Matsudaira (2008) used test scores to evaluate the impact of summer school attendance on students' performance. In this system, a student that scored less than an arbitrary grade was more likely to be ...
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13 views

2SLS in Fuzzy Regression Discontinuity

What is the logic of conducting an IV-2SLS in Fuzzy Regression Discontinuity Design? Why can't we run a regression just like in Sharp RD?
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4 views

Combine Noisy predictions from an optical character recognition program

I am trying to perform optical character recognition on a field of text from different angles as the camera passes over it and beyond it. Due to the 3D skewing of the image, thee readings of the OCR ...
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16 views

Fuzzy Regression Discontinuity and Instrumental Variables

What is the logic behind using an IV for a fuzzy RD?
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13 views

How should I understand a Self-Organizing Fuzzy Neural Network?

I'm currently doing research to write a paper for a conference submission (undergraduate-level) and had a question regarding the research I've been conducting. My topic is on using Twitter sentiment ...
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39 views

Smoother Regression Results with KNN in Regression

Weak learners like tree, knn etc. provides regression like stairs. You can examine this example: https://scikit-learn.org/stable/auto_examples/neighbors/plot_regression.html I want to make a ...
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21 views

How to extract and filter rules from C5.0 package for making fuzzy rules

I have project on a ML dataset. I have performed decision tree using C5.0 package in R. For the next part I want to make fuzzy logic based on C5.0 results. I have 2 questions: 1- How can I filter and ...
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40 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
226 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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596 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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345 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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20 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
71 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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51 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
284 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
26 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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484 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
96 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
55 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
748 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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40 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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79 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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49 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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136 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
138 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
94 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
64 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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74 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
75 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
146 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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74 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
620 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
543 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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94 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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418 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
174 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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1answer
310 views

Multiple correspondence analysis with fuzzy coding

I have a data set with six continuous variables. I would like to perform a multiple correspondence analysis (MCA) with fuzzy coding. I was able to create the fuzzy coding, so for each original ...
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268 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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123 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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641 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
700 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
65 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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32 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
89 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
9k 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 ...
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1answer
786 views

Fuzzy regression (using linear programming) [closed]

I want to replicate a fuzzy regression using a linear programming problem approach. I have the following information: " A fuzzy regression analysis with only one independent variable X results in ...
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1answer
294 views

Is it posible to perform the inverse of multidimensional scaling analysis

We have lot of 3D data and we reduced it to 2D for performing fuzzy clustering and obtaining prototypes. We used some matlab functions that were very well documented. Now we would like to see to which ...