Single station correlation non-results problem and additional questions

[sujan1746]

Hi, I have a question related to single-station correlation calculation.

I calculated dv/v by using below configure.

components_to_compute,"ZZ,ZE,ZN,EZ,EE,EN,NZ,NE,NN" components_to_compute_single_station,"NZ,EN,EZ"
autocorr,Y

However, when I check the correlation and dv/v results, there is no calculation result for each same station, but only for cross-correlation results from different stations.

I am not sure the reason of the problem.

Additional question #1. What is difference between auto-correlation and single correlation? And How can I determine the difference in results between auto-correlation and single-correlation?

Additional question #2. Do you know the reason that the dv/v and groundwater level variation show positive correlation? I have known that they show negative correlation relationship but is it possible to show positive correlation?