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Hi,
1)How can I get the probability of the correlation coefficient significantly different from 0? I know, this is possible via the command: matrix_name.cor(prob), but how can I get it via a command with 2 series i.e. scalar cor_pvalue =@cor({%Y},{%X})?

2)In a vector V1 (extracted from correlation matrix) containing 5 correlation coefficient from variables (X1,to X5), I would like to identify the variable with a highest correlation coefficient.
How can I get the name of the variable? %selected_variable = @cimax(V1)?

Thanks

1) Put the series into a group then use group.cor(prob)

2) Hard to say without seeing the rest of your code. But assuming you have (or can put) the names in a string somewhere:

!kmax = @cimax(Vcor) leads to "Error assigend to scalar", Why?
I think perhaps better to sort the vector by descending order and to select the second line V1(2).
By the way how can I constraint te command "@cimax" e.g. !kmax = @cimax(Vcor) <>1, i.e.select max from the vector different to "1"?

You cannot.