Normalize data before measuring the distance

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KnowledgeSeeker
KnowledgeSeeker am 20 Mär. 2014
Beantwortet: Shashank Prasanna am 20 Mär. 2014
I am trying to measure the correlation between data (a row vector). I use euclidean distance to measure how correlated each feature to one another. I want to measure the distance of the first feature against the rest of the features. First I normalize my data:
normalizedData = x/sum(X)
second I use Euclidean distance to measure the distance of one feature to the rest of the features
mydata = {}
for Idx = 1:numel(normalizedData)
euclidean_distance = normalizedData(1) - normailizedData(Idx)
mydata{1,1} = euclidean_distance;
end
I am wondering if the above way is correct or incorrect? can someone suggest me or give me an opinion.
Thank you

Antworten (1)

Shashank Prasanna
Shashank Prasanna am 20 Mär. 2014
You can use pdist2 to compute pairwise distances:
If you want to standardize the data before hand, you can use zscore:
But if you want to find correlation between to features you use corr
corr(X(:,1),X(:,2))

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