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Interpretation of corr function in R and corrplot function in R

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@manishceeri wrote:

My question may look trivial to many but I am really confused over the concept of correlation?

I applied corr function to complete data frame and gets the values b/w (numeric) features as: 1.795702e-03, -3.072601e-03, -6.481803e-04, 8.701917e-04, 9.061027e-05 and so on.

Question:

(a) What is the interpretation to corr function output values that varies b/w negative and positive.

(b) Based on the Values of corr function, when should we keep the feature/variables/columns in our data set OR should we delete them.

© how and when to use corrplot function as almost every kernel uses it.

(d) how to interpret corrplot function.

I request to take some time to answer my question. Also if I could get some link to video or tutorial or document related to it

Warm Regards

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