Community Profile # Jeff Miller

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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...

alrededor de 18 horas hace | 0

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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...

19 días hace | 0

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

28 días hace | 0

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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...

alrededor de 1 mes hace | 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...

alrededor de 1 mes hace | 0

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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; ...

alrededor de 2 meses hace | 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...

alrededor de 2 meses hace | 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 '...

alrededor de 2 meses hace | 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...

2 meses hace | 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...

4 meses hace | 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...

4 meses hace | 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...

4 meses hace | 1

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How to integrate a lognormal pdf
It's hard to say for sure without seeing your xx and xxx values, but maybe it is just your expectations that are faulty? Certai...

4 meses hace | 0

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Find number of factors for factor analyses
My \$0.02 worth: I would suggest running facan with nBasis=8 and checking the resulting scree plot (plot of eigenvalue as a func...

4 meses hace | 0

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linear mixed-effects model (fitlme) add array variable
I'm pretty sure the predictors have to be single values, so you can't feed in an array as a single unified predictor. You could...

4 meses hace | 0

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Using pdf to find threshold
I'm not entirely sure what you mean by "threshold", but maybe you are trying to identify the middle 95% of the distribution? If...

4 meses hace | 0

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Anova-n outputs as not full rank. Returns NaN P-value.
The short answer is that you have to collect more data to fix this. Look here: >> crosstab(gX1,gX2,gX3) ans(:,:,1) = 7 ...

6 meses hace | 0

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problem with the anova calculation
Just change one line to this mdl = fitlm(tbl,'pick~C_t')

6 meses hace | 0

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Can I find likelihood function of an objective function?
A lot depends on the details of these models, but one way to proceed would be in terms of the error scores. Consider the full mo...

6 meses hace | 1

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ANOVA result No p-value.
The problem is that the full model has 90 parameters and predicts a separate mean for each of the 3*3*10 conditions. But you onl...

6 meses hace | 0

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I am having trouble with errors in the array used for anova analysis
Looks like g1 should be a numerical vector, not a cell array (i.e., square brackets instead of curly brackets). e.g., g1 = [1,2...

6 meses hace | 0

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How to fit lognormal distribution on my data
If the scores are in vector1 and the counts are in vector 2, you could fit like this by the method of moments (should be OK with...

7 meses hace | 0

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How do I display Tiled Layouts properly?
I haven't used tiled layouts yet so this may be way off-base, but something like the following has solved similar scaling proble...

7 meses hace | 0

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How do I calculate the signal to noise ratio of a signal without knowing the noise of the signal?
I'm not sure whether this fits your situation, but one way to estimate the noise is to subtract the average of the epochs from e...

7 meses hace | 1

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Poisson PMF using MATLAB
This might get you started... k = 0:17; pmf = poisspdf(k,4); figure; plot(k,pmf,'o-')

7 meses hace | 0

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May I ask how I can find 95% confidence interval of skew_FP() from these codes?
LBUB = prctile(skew_FP(),[2.5,97.5]);

7 meses hace | 0

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Using a specific number of digits
Maybe by "report k" you are referring to printing it, in which case this should work for k=1:100 fprintf('%03d\n',k) end

7 meses hace | 0

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How to computing confidence bounds of the regression model using the bootstrap method
I'm assuming that your figure shows t on the horizontal axis and y on the vertical. The problem is that bootci is giving you co...

7 meses hace | 0

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How do I update an inherited property in both the SuperClass and SubClass simultaneously in real time?
The superclass/subclass relationship is a little different than you think. When you make SUP and SUB, these are completely diff...

8 meses hace | 0