Jeff Miller

Last seen: Today | Active since 2013

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Linear regression on data with asymmetric measurement error
If you have separate measures of the lower and upper directional error associated with each X value (either empirical or derived...

25 days ago | 0

Answered
Compute conditional mean from distribution
Another approach: pd = makedist('Lognormal', 5, 0.5); lb = icdf(pd,0.01); % find scores at 1% and 5% ub = icdf(pd,0.05); td...

25 days ago | 0

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Answered
Error in generalized linear mixed-effects model with poisson distribution.
I haven't used Poisson models myself, but I thought they required the values of the dependent variable to be non-negative intege...

1 month ago | 0

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F values come out as Infinity using the anovan function
The underlying problem is that the d.f. for error is 0, which is responsible for the 0 MS error. In essence, there are not enou...

2 months ago | 0

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How to Calculate the Effect Size at p=.05
You can get an answer by computing a confidence interval for the Cohen's d. Specifically, at p=0.05, one end of the confidence ...

2 months ago | 0

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How to locate 'Cupid-master' path on my system
I think Cupid-master is just a folder name that others have used when they installed the files, and you can just addpath to your...

2 months ago | 1

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How to extract 3 Weibull parameters obtained using method of moments
parms = weib.ParmValues; % this function reports back the current parameter values of the weib distribution.

2 months ago | 1

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Compute group statistics when the group definition is an OR of values found in several columns of a table
Maybe reformat the table with stack: T=table([1 1 2 3 3 4]',{'John','Bob','Emma','Emma','Bob','Bob'}', ... {'Emma','','Bob...

2 months ago | 0

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Writing Matlab Table to File
Try this: str = formattedDisplayText(S); str = erase(str,"<strong>"); str = erase(str,"</strong>"); fprintf(file,"%s",str); ...

2 months ago | 0

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parfor variable classification issue revisited
Maybe something like this would be helpful, using the wonderful allcomb. idx = allcomb(1:5,1:6,1:7,1:8,1:9); nrows = size(idx,...

4 months ago | 0

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Create .mat file which appends a variable each time a function is executed
Maybe you can use the function 'matfile' to do what you want. Here is a little example: % This is part of the main program / s...

4 months ago | 0

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Answered
Why are pool workers going inactive while many iterations remain?
What you would like is for any free processor to take up any waiting task (me too), but for some reason that's not how it works....

4 months ago | 0

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How to generate a Frechet distribution using Methods of Moments?
Here is how you might do it if with Cupid : %% Example for the 2-parameter Frechet distribution (minimum known to be 0) % M...

5 months ago | 0

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How can I calculate True positive, False positive, True negative and False negative of real and predicted dataset?
First you need to map your 3 values 1-3 onto just two categories: positive and negative. For example, you might decide to call ...

5 months ago | 0

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Answered
Linear Regression with Only Dependent Variables
It sounds like you can get what you want from simply [rho, pval] = corr(matrixA(:,1),matrixB(:,1)) fitlm is for situations wit...

5 months ago | 1

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Answered
How to use chi2gof within CUPID
Yes, that is correct. The successive bin probabilities are the differences of the successive CDF values, and the expected numbe...

6 months ago | 1

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Goodness-of-Fit for a best-fitting distribution? (by using CUPID)
There are lots of different ways to evaluate the goodness of fit of a given theoretical distribution to a dataset (see, e.g., wi...

6 months ago | 1

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Answered
Fit a statistical distribution to truncated data
If you would like to fit a variety of truncated distributions in addition to the normal, you might find Cupid helpful. For inst...

6 months ago | 2

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Answered
Fit parameter to Weibull distribution
The problem is a bad choice of starting values. You will get much better parameter estimates with params = mle(A,'pdf',customp...

6 months ago | 0

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Answered
Using Psychtoolbox KbCheck() functions, how can I test for a renewed keypress?
One approach is to check timeSecs. This will be very small if the key is continuously held down from the previous trial, but pre...

7 months ago | 0

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Answered
How can I make heatmap scale fixed?
e.g., h1 = heatmap(); h1.ColorLimits = [0 1000];

7 months ago | 0

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Answered
Simple function for obtain a T statistic from sample mean, stdev & hypothetical mean
Here you go: t_observed = (sample_mean - hypothetical_mean) / sample_sd * sqrt(n); n is the number of scores averaged to get t...

7 months ago | 0

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creating standard error of mean for bar graphs in code, can you please correct/modify/help my code?
Hard to say for sure without knowing what the original data were, but that doesn't look right to me. Can you explain how the va...

8 months ago | 0

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Answered
Generating correlated data for simulation
One option is to create the second array by adding a random number to each element of the first array. For example sigma = 1; ...

8 months ago | 0

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I want to create a QQ & PP plot using L-Moments to fit the GEV but get this error: unable to perform assignment b/c the left & right sides have a different number of elements
Assign the problematic result to a new variable so that you can see what elements it has, like this: temp_var = psi + alpha*(1...

8 months ago | 0

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question on repeated measure GLM model
I don't fully understand the design so I won't attempt to answer questions 2) or 3), but I think this is the answer to 1): If '...

8 months ago | 0

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How to run the ANCOVA test with categorical covariate in matlab?
It doesn't really make sense to run ANCOVA with a categorical covariate. Instead, think of the categorical covariate as another...

9 months ago | 0

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How can I perform wilcoxon Test with paired samples and vectors of differente sizes?
The Wilcoxon test is for data that come in pairs, so the vectors must be the same size. If you are just missing one score or th...

10 months ago | 0

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Getting a percentile from a histogram
Usually this is done by linear interpolation within the relevant bin. To stick with your 95th percentile example, suppose you h...

10 months ago | 0

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A problem in the usage of multidimensional scaling (cmdscale)
You can't cancel that. With only the distance information in D, the mds function has no way of knowing what is up/down/left/rig...

10 months ago | 1

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Jeff Miller

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