Table 7 Results of the principal component analysis
Category | Variable | Principal component loading | |||
Urbanicity | Middle-density regionality | Workplace regionality | Childcare regionality | ||
Population | Proportion of population aged under 15 years | 0.47 | –0.11 | –0.10 | 0.73 |
Proportion of population aged 65 years and over | –0.93 | –0.05 | –0.07 | –0.32 | |
Proportion of population change | 0.93 | 0.00 | 0.04 | 0.29 | |
Population density | 0.73 | 0.01 | 0.16 | –0.51 | |
Proportion of daytime to nighttime population | –0.03 | 0.02 | 0.86 | –0.02 | |
Proportion of population in densely inhabited districts | 0.78 | –0.26 | –0.09 | 0.08 | |
Proportion of internal migrants from other municipalities | 0.53 | –0.47 | 0.22 | 0.12 | |
Household | Persons per household | 0.09 | 0.89 | –0.13 | 0.05 |
Proportion of single-person households (excluding households aged 65 years and over) | 0.59 | –0.35 | 0.37 | 0.08 | |
Proportion of single-person households aged 65 years and over | –0.87 | –0.56 | –0.10 | –0.25 | |
Proportion of nuclear households | 0.15 | –0.02 | –0.68 | 0.37 | |
Proportion of double-income households | –0.20 | 0.85 | 0.07 | –0.01 | |
Proportion of households living in a detached house | –0.70 | 0.42 | –0.13 | –0.08 | |
Proportion of households living in a government-owned rental housing | –0.38 | –0.71 | –0.10 | –0.05 | |
Industry & Work | Proportion of workers in primary industry | –0.76 | –0.04 | 0.16 | –0.09 |
Proportion of workers in secondary industry | 0.18 | 0.95 | 0.02 | –0.07 | |
Proportion of workers in tertiary industry | 0.15 | –0.47 | 0.16 | 0.08 | |
Proportion of working population | –0.30 | 0.69 | 0.28 | –0.07 | |
Proportion of commuters using rail | 0.87 | –0.01 | –0.17 | –0.36 | |
Proportion of commuters using their own vehicle | –0.60 | 0.43 | 0.13 | 0.30 | |
Annual retail merchandise sales per capita | 0.15 | 0.03 | 0.86 | 0.04 | |
Municipal residence tax per capita | 0.79 | 0.07 | 0.37 | –0.19 | |
Land utilization | Proportion of densely inhabited district areas | 0.80 | –0.02 | 0.03 | –0.46 |
Proportion of land area used for building | 0.91 | 0.05 | –0.08 | –0.34 | |
Proportion of forest area | –0.85 | –0.06 | 0.10 | 0.01 | |
Proportion of land area used for rice paddies and agriculture | 0.13 | 0.16 | –0.10 | 0.50 | |
Proportion of depopulated area | –0.92 | –0.16 | 0.11 | –0.14 | |
Number of pre-merger municipalities | –0.18 | –0.07 | 0.22 | 0.42 | |
Information volume | Urbanicity | Middle-density regionality | Workplace regionality | Childcare regionality | |
Sum of squared loadings | 10.9 | 4.90 | 2.69 | 2.31 | |
Contribution rate | 0.39 | 0.17 | 0.10 | 0.08 | |
Cumulative contribution rate | 0.39 | 0.56 | 0.66 | 0.74 | |
Correlation coefficient between principal components | Urbanicity | Middle-density regionality | Workplace regionality | Childcare regionality | |
Urbanicity | - | –0.37 | 0.18 | –0.05 | |
Middle-density regionality |  | - | –0.21 | 0.42 | |
Workplace regionality |  |  | - | –0.08 | |