Data Quality#

The validation harness, surfaced. Use this page to judge how much to trust the numbers on the other tabs today.

Bond Pricer Accuracy vs BIST Ground Truth#

For every bond where BIST publishes both price and compound yield today, we run our pricer and compare to BIST. This is the closest thing to ground truth.

Bonds Validated

on 2026-07-21

Median Error

0.083 pp

PASS

95th Pctile

0.23 pp

100% within 1 pp

Max Error

0.49 pp

single worst case

Corporate Bond Yield Coverage#

How many of the 1,137 corporate ISINs in the master have yield data via each source.

Traded today (BIST yield)

freshest source

With auction yield

574

from tbliste

Floaters (require TLREF curve)

558

PENDING TLREF forward curve

Total corp universe

1,137

in dim_instrument

KAP Sukuk Enrichment (SPV → Fund User Mapping)#

Sukuk in this dashboard are issued by Varlık Kiralama SPV entities, but the credit exposure is to a different operating company (the Fon Kullanıcısı). KAP disclosures publish that mapping; we cache it in data/dim/kap_enrichments.csv. See CONVENTIONS.md §14.

Corporate Sukuk Universe

282

private lease certificates

KAP Enriched

282

disclosure parsed

Fund User Mapped

282

100% of universe · GOOD

Total KAP Rows

1,433

includes historical issuances

Credit Rating Coverage#

How many KAP-enriched ISINs come with a published credit rating for the Fund User or Source Org. Investment-grade share among those that do.

Rated Disclosures

1,415

99% of 1,433 · GOOD

Investment Grade

1,293

91% of rated

Below IG

122

non-IG borrowers

Unrated

disclosure didn't publish a rating

Source File Schema Status#

One row per upstream BIST file. OK = expected column set; SHAPE = column count drifted but required fields present; DRIFT = a required field is missing.

Source file schema status table
Source	Status	Rows	Columns	Notes
instrument_activity	OK	28,808	50	all required columns present
valuation	OK	59,410	6	all required columns present
dim_instrument	OK	2,128	20	all required columns present
market_summary	OK	4,665	9	all required columns present
tlref	OK	4,695	6	all required columns present
repo_maturity	OK	39,123	8	all required columns present
kap_enrichments	OK	1,433	46	all required columns present

Valuation Mark Freshness — tfd file as of 2026-07-21#

BIST republishes the last trade price daily for non-trading bonds. Pricer pairs each tfd price with its actual LAST TRADE DATE to avoid the carry-forward trap.

Total tfd Marks

432

Same-day Fresh

6.0% of marks

1-7 Days Old

>90 Days Stale

138

INFO

Publication Coverage#

Across 131 published dates from 2026-01-02 to 2026-07-21.

GAPS 12 missing days — more than typical holiday count. Sample: 2026-01-14, 2026-03-05, 2026-03-20, 2026-03-30, 2026-04-23, 2026-05-01, 2026-05-19, 2026-05-27

About This Page#

This dashboard is built by a public pipeline that fetches BIST files, normalizes them, and runs the bond pricer against documented yield conventions. Source code, tests, and convention documentation live in the same repo. See CONVENTIONS.md for the rules this page enforces.