How to visualize two histograms for comparative analysis?

2018 4 10
2 个回答
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更新时间：2022 1 28
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0 个投票

Basically I have two datasets and I want to perform a comparative analysis by showing how many data fall under a specific range. Any idea as how to do it?
Thanks Alex

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Pieter VL
Pieter VL 2018-12-6
You can change the transparancy of the bars of the second histogram using the 'FaceAlpha' parameter to create a visible overlay as follows:
hist1 = histogram( ..., 'EdgeColor', 'blue', 'FaceColor', 'blue' );
hold on;
hist2 = histogram( ..., 'EdgeColor', 'green', 'FaceColor', 'green', 'FaceAlpha', 0.2 );
Anupam Sharma
Anupam Sharma 2019-12-12
This is not working in following code. I am using it exactly as mentioned above but it shows the second histogram only. Can you help ?
% MATLAB R2019a
% Setup
N = [1:5 10 20 40];
LB = 0;
UB = 3;
n = 10000;
% Generate random variates
X = LB + (UB - LB)*rand(max(N),n);
Sn = cumsum(X);
mu = 1.5;
sigma = .75;
S_1 = mu + sigma.*randn(n, 1)
hist1= histogram(Sn(1,:),'Normalization','pdf','EdgeColor', 'blue', 'FaceColor', 'blue')
hold on
hist2 = histogram(S_1(:), 'EdgeColor', 'green', 'FaceColor', 'green', 'FaceAlpha', 0.2);
Image Analyst
Image Analyst 2019-12-12
Use subplot to put them into different axes.

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 采纳的回答

Image Analyst
Image Analyst 2018-4-10

2 个投票

The histograms will tell you that - how many counts in each range. Use histogram() for visualization, or histcounts() and bar().

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Alex
Alex 2018-4-11
Thank you Image Analyst. Indeed, I have two datasets (Nx1). For both the datasets, I want to see the number of counts in a specific range. If I use hold on and plot the histograms, it gets overlapped and it is not easy to visualize the difference.
So, I was wondering if I can introduce some sort of transparency or sort of 3D plot.
the cyclist
the cyclist 2018-4-11

Here is an example of using Image Analyst's idea of using both histcounts and bar:

x = randn(2000,1);
y = 0.1 + randn(2000,1);

binRange = -3:0.5:3;

hcx = histcounts(x,[binRange Inf]);
hcy = histcounts(y,[binRange Inf]);

figure
bar(binRange,[hcx;hcy]')
Alex
Alex 2018-4-11
Thanks a lot "the cyclist".

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更多回答（1 个）

the cyclist
the cyclist 2018-4-10

0 个投票

As shown in the documentation for the histogram histogram, you can plot two overlapping histograms on one figure like this
x = randn(2000,1);
y = 1 + randn(5000,1);
h1 = histogram(x);
hold on
h2 = histogram(y);
If you have the Statistics and Machine Learning Toolbox, you can also use the Kolmogorov-Smirnov test to determine whether the CDFs of the two distributions are statistically different.

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Alex
Alex 2018-4-11
Thank you cyclist for the answer. Yes, I was using the hold on command. Unfortunately, it is difficult to visualize when I want to check number of counts in a range. So, I wondering if I could introduce any transparency or maybe plot 3D?
Milagre MANHIQUE
Milagre MANHIQUE 2022-1-28
Hallo Matlab community
I would like to plot two histograms from two different datasets on the same graph (overlapping and transparent), but each of the histograms containing the respective fit curve.
I tried to use the histfit command on each dataset but was unsuccessful.
I ask for help please
Milagre MANHIQUE
Milagre MANHIQUE 2022-1-28
Thank you very much, I will proceed as you advise.
I thank you deeply.
Milagre MANHIQUE

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