user studies for brushing points in scatterplots

In the user study data (50 users in user study 1 and 10 in user study 2):

id: the user id

x,y are the coordinate of the point if mark=0; x,y are the coordinate of the start point/end point of the interaction if mark=1 or 2.

dataset: dataset id

question: the question used in the user study 

pointNum: if mark=1, pointNum is the id of the point; if mark=2, pointNum is the time spend of lasso while if mark=3, pointNum is the time spend of the click-and-drag interaction. 

In the dataset folder, it includes the 12 different datasets and the first 6 were used in user study 1 while the rest were used in user study 2.