Crossfilter and dc.js mean value

[Michael G]

Hi,

I have this data set:

tick    ID    Name    val1    val2    val3    val4
0       1     Name1    0.7    0.1       0.2    0.1
1       2     Name2    0.8    0.1       0.1    0.1
2       3     Name3    0.4    0.1       0.2    0.3
3       4     Name4    0.6    0.1       0.2    0.1
4       1     Name1    0.7    0.1       0.2    0.1
5       2     Name2    0.8    0.1       0.1    0.1
6       3     Name3    0.4    0.1       0.2    0.3
7       4     Name4    0.6    0.1       0.2    0.1

I already visualized everything with crossfilter and dc.js, except one 
diagram. I want the mean value of the column val1, val2, val3 and val4.

I have visualized this map with dc.js alread. The ID in
 the data is a segement in the image. The ticks are rounds, for instance
 the object with id 1 at tick 2 has the values 0.7, 0.1, 0.2 and 0.1. So
 the mean data should be connected to the segments. For instance when 
only the blue object with ID 1 is selected it should show the mean of 
the current selection. If I select a second object with ID 2, it should 
show the mean value of the both segments. How can I accomplish this, 
because this was the only visualization that didn't worked.