How to generate joint frequency table?

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Rouyu Chen
Rouyu Chen 2023-4-12
评论： Rouyu Chen 2023-4-12
Dear experts,
I have two vectors and I want to make a joint frequency table, I tried tabulate but failed, I was wondering what is wrong with my code, and if there is any other code can help me do this?
Many thanks!
Below is the code I tried:
% Two vectors
Attribute
Assignment_result
% Combine them together
data=table(Attribute,Assignment_result)
% Tabulate
joint_freq=tabulate(data.Attribute,data.Assignment_result)
disp(joint_freq)
But matlab suggests 'too many input arguments'
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Dyuman Joshi
Dyuman Joshi 2023-4-12
tabulate() accepts only 1 input, whereas you are giving 2 inputs to it.
What are you trying to do? Calculating the frequency of 1 vector w.r.t to other?
In any case, please attach your data (use the paperclip icon to do so), and mention the output you want to obtain.

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the cyclist
the cyclist 2023-4-12
Ran in:
It isn't perfectly clear what you mean, but I think this does what you intend.
% Set the seed, for reproduciblity
rng default
% Two example vectors
vector1 = randi([1, 3], 5, 1);
vector2 = randi([1, 3], 5, 1);
% Combine the vectors into a matrix
data = [vector1, vector2]
data = 5×2
3 1 3 1 1 2 3 3 2 3
% Unique rows and their indices
[unique_rows, ~, row_indices] = unique(data, 'rows');
% Frequency of each unique row
freq = histcounts(row_indices, 1:size(unique_rows,1)+1);
% Combine the unique rows and their frequencies into a table
freq_table = table(unique_rows, freq', 'VariableNames', {'UniqueRows', 'Frequency'})
freq_table = 4×2 table
UniqueRows Frequency __________ _________ 1 2 1 2 3 1 3 1 2 3 3 1
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the cyclist
the cyclist 2023-4-12
Ran in:
Ah, you want a cross table:
% Set the seed, for reproduciblity
rng default
% Two example vectors
vector1 = randi([1, 3], 5, 1);
vector2 = randi([1, 3], 5, 1);
[tbl,chi2,p,labels] = crosstab(vector1,vector2)
tbl = 3×3
0 1 0 0 0 1 2 0 1
chi2 = 6.6667
p = 0.1546
labels = 3×2 cell array
{'1'} {'1'} {'2'} {'2'} {'3'} {'3'}
Rouyu Chen
Rouyu Chen 2023-4-12
This is exactly what I am looking for, thank you so much!

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