Heidelberg Catechism — similarity of two editions

A: 2nd ed. 1563 (Libri symbolici, Vinke, 1846)
B: 3rd ed. 1563 (Heidelberg: Mayer)

Similarity	98 / 100 (weighted average: structure 20%, wording 70%, spelling 10%)
Structure	99.6
Wording	98.5
Spelling	95.8

Word-by-word comparison → Read side by side

Structure: 99.6

The average of two figures:

Units and order: 100. A has 132 units (questions, articles, rejections, and divisions such as Lord's Days, parts or heads), B has 132; 132 are in both.
Form of the shared units: 99.2. A unit counts as having a different form when one edition's text is less than 80% of the length of the other's.
Different form: Q 80 (90 vs 142 words).

Wording: 98.5

The share of words the two editions have in common in the units present in both (7309 words in A, 7358 in B), weighted by length. Case, punctuation, Scripture references and spelling variants are ignored: old spellings are levelled before comparing (e.g. u/v, i/j/y, th/t, doubled letters), and long words that differ in only a letter or two count as the same word. This levelling is approximate, so a few spelling variants may still count as different words.

Units with the most different wording:

Unit	Wording	Spelling
Q 80	74.1	89
Q 91	89.7	94.2
Q 116	91.3	91.7
Q 118	92.9	96.2
Q 106	93.7	91.9
Q 103	94.3	93.9
Q 39	95.5	94
Q 78	95.6	93.8
Q 47	95.7	98.9
Q 63	96.2	94
Q 64	96.6	96.4
Q 83	96.6	96.4

Spelling: 95.8

Only the words that correspond in both editions count here (7225 pairs), so differences in wording do not lower this score. It is the average of two figures: 92.3% of these words are spelled identically (including capitals), and 99.4% are followed by the same punctuation.

Most frequent spelling differences (A → B):

dass → daß (140×) · auss → auß (31×) · Dass → Daß (28×) · im → jm (14×) · gewiss → gewiß (11×) · biss → biß (10×) · Wass → Was (9×) · diss → diß (9×) · inen → jnen (9×) · brod → Brod (7×) · muss → muß (6×) · das → daß (6×) · blut → Blut (5×) · zeugnuss → zeugnuß (5×) · sondern → sonder (4×)

Units with the most spelling and punctuation differences: Q 80 (89), Q 57 (91.5), Q 116 (91.7), Q 41 (91.7), Q 121 (91.7), Q 106 (91.9), Q 17 (92.2), Q 84 (92.2). The word-by-word comparison ignores punctuation and capitals, so units that differ only in those do not appear there.

Computed 2026-11-06.