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Dear all,
This might have been discussed here before, but I'd like to make sure.
In the clinical EEG field, the upward direction of EEG is called "negative" and downward "positive." However, it seems that there is confusion in the research field: The majority call the upward "positive," although some people use it in the same way as in clinical settings.
Is there any consensus regarding the NSRR data? I assume "negative to positive zero-crossing" in LUNA means down to up. Is my understanding correct?
Thank you so much
Dear Shaun,
Thank you so much for your 'perfect' answer. We can advance our discussion based on your thoughts.
Very best
I want your opinion regarding the comparison of sleep parameters calculated by LUNA, as I don't have much experience in multi-center research.
Now, we can compare the sleep data from multiple facilities thanks to the effort of the NSRR team. What I want to know is if there are problems in directly comparing the data acquired with different PSG systems and conditions.
Putting aside the inter-rater variability in sleep scoring, should I avoid directly comparing the results of PSG analysis (e.g., frequency analysis or sleep microarchitecture parameters such as SO and spindle) using data from different facilities? Are there any guidelines or recommended methods that enable us to make a direct comparison?
Many thanks,
Thank you so much for your quick and kind reply! I truly appreciate it.
Thank you as always for your kind support.
I want to analyze the PSG data from NCH Sleep Data Bank using LUNA. I created a sample list from edf and annotation files (.tsv), but LUNA returned the following error message to any analysis. “error : invalid interval (start) : onset duration description”
I’d appreciate it if you would tell me how to deal with it.
Many thanks