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Jeff Miller


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433 total contributions since 2013

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Answered
Alternative for two way anova
One option is to ignore the problem and do ANOVA despite the non-normality. ANOVA is pretty robust with respect to normality vi...

environ 7 heures ago | 0

Answered
How can I fit a flexible distribution to a set of percentiles?
A normal distribution fits very well: see attached for a figure and the matlab code to generate it. There is no obvious skew (5...

1 jour ago | 0

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Plotting a line representing Spearman's correlation on a scatterplot
I'm not sure a mismatch between slope and correlation is necessarily a problem. Note that the slope doesn't equal the correlati...

7 jours ago | 0

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How to exclude data when fitting an exponential distribution
You can make use of the memory-less property of the exponential here--the mean remaining time is independent of how much time ha...

7 jours ago | 1

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Answered
Can MATLAB Handle a Triple Nested Struct?
Haven't tried it, but it seems like this should work: for i = 1:length(Calendar) for j=1:12 Calendar(i).Month(j)....

8 jours ago | 1

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setting up a nested data structure
Your information architecture diagram doesn't look quite right. For example, your [Females] should be a structure that holds hei...

9 jours ago | 0

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Answered
Distribution Fitting Tool - finding of best fitting distribution type
It depends on exactly what you mean by "best fitting curve". In general, there is certainly no guarantee that the best-fitting ...

10 jours ago | 0

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Answered
Obtain a random number from a truncated normal distribution
You seem to be asking for something like this: pretruncMean = 0.9; pretruncSD = 1; untruncated = makedist('Normal',pretruncMe...

10 jours ago | 1

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Answered
Constrain regression coefficients to be equal
Make a new variable with IndependentSum = Independent1 + Independent2; and then fit the model with Dependent~IndependentSum

11 jours ago | 0

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How do I make a probability plot with data on the y axis and probability on the x axis?
Something like this: % some random data for an example nSample = 500; floodData = rand(nSample,1); % percentiles/probabili...

16 jours ago | 0

Answered
How to calculate random Correlation Pairs
Make a matrix A with one column for each voxel, and then use cormatrix = corrcoef(A) The output will be the correlations for a...

16 jours ago | 0

Answered
How to calculate a transformed distribution in Matlab?
Depending on the transformations you have in mind, you may be able to do what you want with Cupid. It's transformation distribu...

17 jours ago | 1

Answered
Chi square test: non parametric
It sounds like this is what you want: % Create some fake data to use as an example, % with 3 groups of different sizes; score...

23 jours ago | 1

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Answered
fitglme error says data is not full rank, but it is.
I'm guessing: (1) your ID column is a unique identifier rather than an actual numerical predictor value, and (2) you only have o...

23 jours ago | 0

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How can i speed up my nested for loops ?
You can speed this up to some degree by rearranging the order of your for loops. For example, consider: d1 = floor((n1*x/c)...

28 jours ago | 0

Answered
mvncdf - invert sum direction
(1) There is no way to get mvncdf to be larger at (6,7) than at (6,13). (2) It might be useful to you to reconceptualize X2 as ...

28 jours ago | 0

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Answered
y-axis meaning using a ksdensity plot
The y-axis is scaled such that the total area under the density is 1. (area = probability with continuous distributions.) Since ...

environ un mois ago | 0

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Answered
How to setup a Repeated Measurements. model and then perform a Manova
tbl = readtable("libro6.xlsx"); % Remove control group control = tbl.Exp_Group == 9; tbl(control,:) = []; % Define & fit...

environ un mois ago | 1

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Answered
Generate random sequence number with condition
Here is another distributional option with a figure showing the comparison to Bruno's: %% Bruno's solution P=interp1([0 0.9 1]...

environ un mois ago | 0

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count of times if condition is met
put hits = 0; before the 'for' loop. You are resetting hits to 0 each time you check a new ptarget

environ un mois ago | 0

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Using bootstrp with matrices to bootstrap cross-correlations using xcorr?
Bootstrapping involves taking random resamples of the existing data to create datasets of the same size, but it is not exactly w...

environ un mois ago | 0

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How to makedisk for a three parameter weibull distribution
MATLAB's Weibull distribution only allows 2 parameters, so you must handle the offset separately. Try this: t0 = 0.5; % b ...

environ 2 mois ago | 1

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Answered
How to use fitdist or gevfit and force the GEV distribution to a specific type (Type I)
I think you want the extreme value type I or Gumbel distribution, which MATLAB seems to call the "ExtremeValue" distribution. S...

environ 2 mois ago | 0

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Answered
How should I organise data for unbalanced two factor anova analysis (anovan)
To start with, you have to make a table with 25 lines, one for each member of each group, and 4 variables for intensity plus one...

environ 2 mois ago | 1

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How to draw multiple random numbers from kernel estimated densities at once?
Can you reorganize your code so that you generate many random numbers at once from each density, store them in vectors, and then...

environ 2 mois ago | 0

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How do I fit gaussian function to data whose only information I have is the minimum, maximum and number of data points?
Mostly I agree with Alan, but I'd say that your guess for the number of standard deviations should not be a constant of 6 but sh...

environ 2 mois ago | 0

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Answered
Within Subjects Repeated Measures ANOVA - fitting a model
The first data table definitely isn't in the format that fitrm expects. Each row of the table should be a single subject from o...

environ 2 mois ago | 0

Answered
passing a variable name to a function
You can use 'strings in parentheses' to address object and structure fields, so I think you can simply replace ev...

environ 2 mois ago | 0

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Answered
How to bootstrap estimated Gamma parameters from sample 95% confidence
Generate 1000 (say) bootstrap samples from X. For each sample, compute the parameter estimates, so in the end you have 1000 est...

environ 2 mois ago | 0

Answered
Convolution? Kernal density? Resample? Help!
As I understand it, you could approximate your situation (to any desired degree of accuracy) using a table with 3 columns: X Y...

environ 2 mois ago | 0

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