Table 4 Mallow’s \({C}_{p}\) and parameter selections of 11 variables.

From: A hierarchical study for urban statistical indicators on the prevalence of COVID-19 in Chinese city clusters based on multiple linear regression (MLR) and polynomial best subset regression (PBSR) analysis

Cluster

\({\varvec{p}}\)

Selected p

Mallow’s \({{\varvec{C}}}_{{\varvec{p}}}\)

High-level

5

‘LTN’, ‘JOR’, ‘PHF’, ‘PGDP’ ‘DRW’. LMS

0.488

Middle-level

4

‘LTI’, ‘JOR’, ‘PHF’ ‘DRW’

 − 0.1436

Low-level

6

‘LTN’, ‘LTI’, ‘LPD’ ‘JOR’, ‘PGDP’, ‘LDW’

4.3701

  1. The parameter numbers (\(p\)) indicates the maximal parameter number in the mathematical model.
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