Hi Lisa,

1.  It all depends on what kind of analysis you want to do. You can run aparcstats2table without the long_stats_slopes. Then you will get an entry for each time point. If you run long_stats_slopes it will compute the within-subject difference first, put the result into each base directory and then you can stack that (this should be described on the wiki).

2. see also 1. You can also pass a qdec-long table and asegstats2table will automatically pull the data from the *.long.base dirs. Again you would get a single measurement per time point. You could then open that data in a stats software or matlab and do your statistics there, or use our LME matlab tools.

Best, Martin

Hi FreeSurfer experts,

I would like to use the asegstats2table and the aparcstats2table commands on my longitudinal data, which have been processing following the longitudinal pipeline (recon-all -cross, - base and finally -long). And I have two questions :

1) Am I obliged to do the ''long_stats_slopes --qdec ./qdec/longi_presentacio.qdec.table.dat --stats aseg.stats --meas volume --do-avg --do-rate --do-pc1 --time months'' command before using the aseg/aparc commands ?

2) And I would like to know which subjectsID I have to choose for the command line, example :
asegstats2table --subjects 001_tp1 002_tp1...etc. (cross)? OR template_001 template_002...etc (base)? OR 001_tp1.long.template_001 002_tp1.long.template_002...etc (long)?
Knowing that it's for a comparison test-retest (microlongitudinal : 1 month).

Thanks you in advance for your precious help,

Best regards,

Lisa

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