# r3-b1-04

**Claim (as registered):** The medium_class mix of Korea's national manuscript-catalogue source (the split between manuscript, woodblock, movable_type, and unclassified rows) is stable within +/-10 percentage points per category as the source grows.

**Proposed mechanism:** A stability/no-regime-change claim: organic growth of the source is expected to leave the internal proportions of its medium-classification roughly fixed, absent a change in the classification pipeline itself or a sharply different period of material being added.

**Scope:** This conjecture concerns the manuscript-catalogue source(s) named below only -- it does not involve NAMAMI or India data at all, and is not decided by NAMAMI's India-state holdout in any way (no India state's landing can confirm or refute it). It is decided only by future growth of, or new landings to, the specific source(s) named below; no such test has run yet. Specifically: Korea's national manuscript-catalogue source (499,003 rows at registration).

**Training-side evidence:** Baseline shares (this measurement IS the registered baseline, confirmed essentially unchanged from an earlier snapshot days before): unknown 64.56% (322,148), manuscript 16.05% (80,083), woodblock 12.65% (63,128), movable_type 6.74% (33,644).

**Holdout test and outcome:** No holdout test has been run for this conjecture. Evaluate the rival mechanisms against the training evidence alone.

**Status:** Not yet tested; decided only by future growth of this one source.
