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Table 1 Baseline and learned λ values for interpolating between Terrier and PageRank scores (expanding 20 related articles).

From: PageRank without hyperlinks: Reranking with PubMed related article networks for biomedical text retrieval

Tuning on MAP20
  MAP20
Baseline 0.386
Learned (λ = 0.7) 0.416 (+7.8%)*
Tuning on MAP40
  MAP40
Baseline 0.524
Learned (λ = 0.7) 0.544 (+3.8%)*
Tuning on P20
  P20
Baseline 0.359
Learned (λ = 0.6) 0.381 (+6.1%)*
  1. Improvements are statistically significant based on the Wilcoxon signed-rank test (p < 0.05).