What is a pop report?

A grading company’s count of how many copies of a card it has graded, at each grade.

What it means

Each grading company publishes its own population report — PSA’s counts only PSA slabs. It lists, for one printing of a card, how many copies the company has graded at each grade.

Collectors read it for scarcity: a card with few 10s is harder to find in a 10. Some rows are not plain grades — qualified grades such as an 8Q, and cards marked authentic with no number.

In SlabScore

Shown beside the price as context, and never used to work anything out: turning it into odds of a grade would be predicting the grade, which SlabScore does not do.
Qualified and authentic rows are counted apart, never added to the plain grade they look like.
A report that was not read shows as unknown, never as zero — zero means nobody has graded one.
It arrives with the card’s prices, so reading it costs no extra lookup.

Your collection opens each card’s Grading Outlook, whose Graded population panel shows the report for the company you chose.

What each row becomes

How SlabScore reads a company’s report, row by row.

In the report	In SlabScore
A count at a plain grade	That count, beside the grade’s price
A qualified grade, such as 8Q	Counted apart from the plain 8
Authentic, no grade	Counted apart
The report’s total	Shown as the company’s total
No report for this printing	Said in words — never a 0

A count at a plain grade
In SlabScore
That count, beside the grade’s price
A qualified grade, such as 8Q
In SlabScore
Counted apart from the plain 8
Authentic, no grade
In SlabScore
Counted apart
The report’s total
In SlabScore
Shown as the company’s total
No report for this printing
In SlabScore
Said in words — never a 0