NA values

[Silvia-Giorgia-Signorini]

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Hi! I am analysing methylation data with methylKit on R and I got some NA values after the unite function, after merging samples:

meth=unite(myobj, destrand=FALSE)

This issue does not allow me to do:

getCorrelation(meth) clusterSamples(meth) PCASamples(meth)

because of this NA. What can I do to solve this issue? Do you have any advice? I really thank you in advance for your help. Silvia