Plot the specialization-vs-diversification allocation covariance

Plots the Olley-Pakes allocation covariance from decompose_specialization_cov() as a line chart, one line per dimension (cropland province, cropland destiny, livestock species), with a zero reference line. Positive and rising values indicate genuine specialization (allocation concentrating into high-surplus units); values near zero or falling indicate diversification. This is meant as a supplementary diagnostic reported alongside (not inside) the main additive decomposition, per the decomposition proposal.

Usage

plot_specialization_cov(covariance = NULL)

Arguments

covariance

A named list from decompose_specialization_cov(). If NULL, computed automatically (slow).

Value

A ggplot object.

Examples

covariance <- list(
  cropland_province = tibble::tribble(
    ~year, ~covariance,
    1960, -0.02,
    1980, 0.05,
    2000, 0.11
  ),
  livestock_species = tibble::tribble(
    ~year, ~covariance,
    1960, 0.01,
    1980, 0.08,
    2000, 0.17
  )
)
p <- plot_specialization_cov(covariance)