Balance The Distribution of a Binary or Nominal Variable

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Sinan Islam
Sinan Islam 2016-7-10
回答： Image Analyst 2016-7-10
Hello,
I am trying to predict a binary target with True/False possible values. The dataset consists of 500 observations, 400 observation is False, and 100 observation is True. In order to avoid model bias, I wish to balance the distribution such that the dataset will consist of 100 False and 100 True observations.
Is there a function in MATLAB that automatically balance binary or nominal distribution? Thank you.

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Image Analyst
Image Analyst 2016-7-10
Just get a random distribution and threshold it. To get 500 observations with about 400 false and 100 true, do this
observations = rand(1, 500) > 0.8;
To get 100 true and 100 false, on average, do this
observations = rand(1, 200) > 0.5;

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