MATLAB: Dumthe dataset in boxplot

boxplot

I have a set of data that I am presenting with the boxplot function. I would like to compare to a national average. I know the national average's median, 75th and 25th percentiles, and I would like to plot my data next to a boxplot showing those values for comparison. Is there a way to create a dummy boxplot to do this? Will I have to create an entire fake distribution?

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Ok, as usual, asking the question has been the trick.

I just created a dataset with 4 entries of the 25th percentile, 2 medians, and 4 of the 75th percentile. Works like a charm.

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MATLAB: Boxplot

This may partially answer what you want. Step 1 would be to take the data for "a" and stretch it out as you describe. Here's one way to expand a data vector according to a vector of frequencies:

f = [4 3 0 1 2];    % frequencies
d = [1 2 3 4 5];    % data
c = [0, cumsum(f)]; % cumulative sum of frequencies
x = zeros(1,c(end));
for j=1:length(c)-1
   x(c(j)+1:c(j+1)) = d(j); % insert each value as required
end

MATLAB: Interaction dummies

Here is a specific example of how to do it. If you need to generalize it and can't figure that out, let me know. The idea is to multiply the first column of d1 by each column of d2, then the second column of d1 by each column of d2:

d1 = dummyvar(T); d2 = dummyvar(R);
d1(:,[1 1 1 2 2 2]).*d2(:,[1 2 3 1 2 3])

Another thing to consider is the x2fx function, using something like this:

x2fx([T R],'interaction',1:2)

This requests that both T and R be treated as categorical, and that all columns for an interaction model be computed. You'll see the result has a column of ones, then dummy columns for T and R separately, then columns for the interaction. The idea is that these will be used in regression, so certain columns are omitted so that the full matrix is not overdetermined.

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Related Solutions

MATLAB: Boxplot

MATLAB: Interaction dummies

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