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We use publication data from all journals in economics, mathematics, physics and chemistry. We compute the ratio of publications that come from the top 25 US departments for each journal and use it as a measure of difficulty to publish in a journal. We find that there is a rather weak but positive correlation (0.20) between the impact factor and the difficulty measure.
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Stored only when both papers are in the corpus — 9 citations exist upstream.
Papers that cite the same references — the relational fallback while embeddings are still backfilling.
Imported from OpenAlex (CC0) — nothing here is generated.