I recently posted a somewhat startling curve showing the total number of NIH contact PIs for all mechanisms in the NIH RePORT database. This showed a drop in the total number of PIs from FY2010 to the present.
As I lay awake thinking about this curve and what might mean, I thought it might change somewhat if I included all PIs instead of just Contact PIs. Recall that the NIH multiple PI policy only went into effect in around 2005.
I was able to examine this point relatively quickly. The results are shown below:
This shows that the inclusion of all PIs decreases the magnitude of the drop since FY2010.
Some other interesting statistics about non-Contact PIs are:
Total Contact PIs: 216,521
Total PIs listed as other than Contact PI: 11,504
PIs who have never been Contact PI: 2,873