Hello,
I have been struggling for quite some time to find a solution for the following
problem. I have a data frame which is organized by block and trial. Each trial
is represented across several rows in this data frame. I'd like to extract the
first x rows per trial and block.
For example
block trial x y
1 1 1 605 150
2 1 1 603 148
3 1 1 604 140
4 1 1 600 140
5 1 1 590 135
6 1 1 580 135
7 1 2 607 148
8 1 2 605 152
10 1 2 600 158
.....
Selecting only the the first two rows per trial should result in
block trial x y
1 1 605 150
1 1 603 148
1 2 607 148
1 2 605 152
The data I am dealing with a x-y coordinates (samples) from an eye-tracking
experiment. I receive the data in this format and need to eliminate unwanted
samples.
Thanks Jens Bölte
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