Hi Tim
Yes, unfortunately this data is based off the data solely from NZQA which is just NCEA data, so does report students who are doing Cambridge or IB as "NA" as that is how the data comes to me from NZQA.
There isn't any way for me to know who these students are, or which schools do this, so can't easily remove them, but it is something that affects the data.
I've added an extra note on the side about this to highlight that this will be an issue, but this is one of the reasons NZQA says that knowing the school contexts when looking at the data is important which I've tried to make an loud and bold as possible (without it looking silly).
Education Counts does have data on school leavers that leave with the equivalent of Level 1, Level 2 or Level 3 which does take into account Cambridge or IB:
For example for Auckland Grammar students leaving with Level 1 or above equivalent:
But this data is looking at something different, and takes a lot longer to come out.
Jake.