Enable aggregation of nodes in table about lineage

[anniecherk]

Just wanted to confirm 2 things:

1. The dot plot jitter should be in y direction? Because the table is to the right of the tree & hence the data is in rows, there's a lot more horizontal real estate than vertical:
   

I think (a) is easier to read than (b) (ie, jitter horizontally, not vertically). Thoughts?

2. Non-aggregated data is also displayed as a dot plot

Also this dataset has "id" typed columns. Any thoughts on how to visually encode / aggregate ids?

I'm temporarily displaying them as just the ID number, but that won't aggregate well:

[anniecherk]

Thoughts on how to handle missing entries (ie, a data point does not have a value for a given column).

Proposed encoding for missing categorical entries: outline where the box would be in a light grey stroke.

Proposed encoding for missing quantitative entries: empty jitter plot with only the median value marked:

[alexsb]

Update:
Categorical values will be represented as a partially filled square, the fill-height is proportional to the number of cases in that category.

Text will be represented either as an ellipsis with details on hover, or sorted by frequency. and truncated.