# Jeff Miller

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**Content Feed**

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 giorni fa | 0

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...

circa 2 mesi fa | 0

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...

circa 2 mesi fa | 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...

circa 2 mesi fa | 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...

circa 2 mesi fa | 0

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...

circa 2 mesi fa | 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...

2 mesi fa | 0

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...

2 mesi fa | 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 ...

4 mesi fa | 0

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problem with the anova calculation

Just change one line to this mdl = fitlm(tbl,'pick~C_t')

4 mesi fa | 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...

4 mesi fa | 1

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...

4 mesi fa | 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...

4 mesi fa | 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...

4 mesi fa | 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...

5 mesi fa | 0

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...

5 mesi fa | 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-')

5 mesi fa | 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]);

5 mesi fa | 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

5 mesi fa | 0

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...

5 mesi fa | 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...

6 mesi fa | 0

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Anova analysis with blocking

You can do this with fitlm as long as you want to test for the effect(s) of interest within a standard linear RCBD model. The h...

6 mesi fa | 0

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Question about "gamcdf" code

To get the 75th percentile value, you need to use gaminv() rather than gamcdf. Also, the shape parameter comes first and scale ...

6 mesi fa | 0

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How to use num2str inside text with latex interpreter?

I think you need square brackets like this to assemble all the characters into a single string text(4,5,['$L_{',num2str(i),'}$'...

6 mesi fa | 1

ttest2 doubt in the results between 2 different groups

The implication of the t-test result is that the difference (even though it looks big to you) could well have arisen by chance e...

6 mesi fa | 0

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Alternative to Eval for small number of variables

Put your workspace variables in a struct and then use var_names to access the fields of that struct, something like this: wrkst...

6 mesi fa | 0

if I set model as 'linear' in 'anovan', is 'anovan' equivalent to applying respectively 'anova1' to the factors?

no, those are not equivalent, as you should be able to verify by applying them both to the same dataset. With its default 'linea...

6 mesi fa | 0

Plot a cumulative distribution with a symmetric logarithmic scale centred at 50%

Not sure if I really understand what you want but maybe something like this: z_app = norminv(cdf_app); % find the normal Z sco...

7 mesi fa | 1

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Error when using: parmHat = wblfit(x)

The problem is that your x vector has some nan's in it, and wblfit can't handle those. Try y = x(~isnan(x)); parmHat = wblfit...

7 mesi fa | 1

How do we modify the tails of norrmal/any kind of distribution by keeping other portion is same?

As Paul says, the details are important because there are infinitely many ways to do what you are asking. One way to think abou...

7 mesi fa | 2