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Mountain moves: Spatial interaction modelling of Bulgaria’s internal migration (1934-1992)
Fig 5
Settlement-level model performance across intercensal periods (1934–1992) according to SRMSE, MAE, and MAPE values.
Colours range from purple (high accuracy) to yellow (low accuracy).
doi: https://doi.org/10.1371/journal.pone.0341180.g005