Questions tagged [matlab]
A programming language/environment. Use this tag for any on-topic question that (a) involves MATLAB either as a critical part of the question or expected answer, & (b) is not just about how to use MATLAB .
1,294
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(Mixed-)model specification and comparison for testing hypotheses concerning continuous ratings
In a behavioral study following a within-subjects design, subjects of various levels of musicality (years of education) gave continuous liking ratings of three audio stimuli, each under three ...
- 2,362
4
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5
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158
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Is it valid to exhaustively test all possible combinations of features to find the best combination?
I have about 1000 labelled observations from about 50 subjects responding physiologically under different situations and am trying to classify the situation (usually into three classes of roughly ...
- 69
0
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0
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15
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How to improve prediction quality of LSTM model
I am trying to train an LSTM-based model in MATLAB to predict 365 next values given 365 previous values of a time series. Input shape is (1000, 365) and output shape is (1000, 365) i.e. there are 1000 ...
1
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0
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How to combine confidence interval (or standard error, or standard deviation) for the sum of 2 fitted parameters
I am fitting a linear mixed model with the equation:
$$
y = \beta_0 + X_1 * \beta_1 + \text{random effects} + \epsilon
$$
I use the model to compare difference of means between two groups, $X_1$ is a ...
- 11
2
votes
1
answer
57
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Why does factor appear significant in 2-way ANOVA but not by inspection (mean +/- sd or error plot)?
I am puzzled about the result of a 2-way ANOVA analysis. The factors are categorical and non-random and the sum of squares used is constrained type III (the choice of categorical or SS type does not ...
- 173
0
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0
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45
views
Heteroscedastic residuals of a VECM estimated by MLE
I have estimated an VEC model in Matlab, and it turns out the residuals are heteroscedastic.
Now, does anyone know how to apply HAC errors to a VEC Model in Matlab?
Alternatively, given the model is ...
- 21
0
votes
0
answers
34
views
Simulate bivariate bernoulli responses with predefined beta coefficients
I have a specific data matrix with features (mainly categorical). I want to simulate a multivariate bernoulli response, for example bivariate, but with a predefined vector of beta coefficients (most ...
1
vote
1
answer
74
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Determining a mix of clusters by using naive Bayes classifiers
I have the following question which I cannot seem to find an easy answer to: given that we have two groups (let's call them 1 and 2), is it possible to determine a mixed percentage of the groups by ...
- 268
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0
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24
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How do I calculate the weighted average of a 2D data set for a 3D structure?
I have a 2D data array indicating a chemical percentage content (PC) in a chemical droplet.
I am trying to calculate the average PC in the droplet.
The image of one of these arrays is shown below (the ...
- 101
0
votes
0
answers
17
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Bootstrapped Confidence Intervals controlling for FWER?
I'm currently using the bootci package in MATLAB to compute bootstrapped confidence intervals. I have data for two variables and I'm interested in comparing differences in means of these variables. ...
- 1
1
vote
1
answer
53
views
Number of simulated statistics more extreme than most extreme real data statistic
I have a distribution of $n_{obs}$ "real" data observations drawn from a normal distribution $X \sim N(\mu,\sigma^2)$, and a number $Q$ of simulated realizations of the same distribution, ...
- 13
1
vote
1
answer
30
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AdaBoost in Matlab - Only get 88% accuracy with Fisher's Iris data set while 100% in one layer Neural Network
I have made AdaBoost in Matlab. I get 88% in accuracy when I use Fisher's Iris flower set data.
Here is the working example:
...
- 425
1
vote
0
answers
62
views
Creating and Using a Skewed Gaussian Distribution in Matlab [closed]
I am very new to matlab, and only used it to do some fairly basic math to visualize a method. Here is an example of what I've done with a normal distribution:
...
- 11
0
votes
0
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26
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Query regarding MI and NMI in the context of image fusion
I am exploring Mutual Information (MI) and Normalized Mutual Information (NMI) in the context of image fusion. While reviewing various sources, it's often mentioned that Mutual Information's value ...
- 1
3
votes
1
answer
77
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What is the correct implementation of MCMC
I am learning Markov Chain Monte Carlo (MCMC) simulation as of the moment. My background is civil engineering and please excuse my ignorance if some of the questions are quite obvious.
I want to learn ...
- 41