index_age {migest} | R Documentation |
Summary indices of migration age profile
Description
Summary measures of migration age profiles as proposed by Rogers (1975), Bell et. al. (2002), Bell and Muhidin (2009) and Bernard, Bell and Charles-Edwards (2014)
Usage
index_age(
d = NULL,
age,
mi,
age_min = 5,
age_max = 65,
breadth = 5,
age_col = "age",
mi_col = "mi",
long = TRUE
)
Arguments
d |
Data frame of age specific migration intensities. If used, ensure the correct column names are passed to |
age |
Numeric vector of ages. Used if |
mi |
Numeric vector of migration intensities corresponding to each value of |
age_min |
Numeric value for minimum age for peak calculations. Taken as 5 by default. |
age_max |
Numeric value for maximum age for peak calculations. Taken as 65 by default. |
breadth |
Numeric value for number of age groups around peak to be used in breadth_peak measure. Default of |
age_col |
Character string of the age column name (when |
mi_col |
Character string of the migration intensities column name (when |
long |
Logical to return a long data frame with index values all in one column |
Value
A tibble with 8 summary measures where
gmr |
Gross migraproduction rate of Rogers (1975) |
peak_mi |
Peak migration intensities, from Bell et. al. (2002) |
peak_age |
Corresponding age of |
peak_breadth |
Breadth of peak, from Bell and Muhidin (2009) |
peak_share |
Percentage share of peak breadth of all migration, from Bell and Muhidin (2009) |
murc |
Maximum upward rate of change of Bernard, Bell and Charles-Edwards (2014) |
mdrc |
Maximum downward rate of change of Bernard, Bell and Charles-Edwards (2014) |
asymmetry |
Asymmetry between the |
Source
Rogers, A. (1975). Introduction to Multiregional Mathematical Demography. Wiley.
Bell, M., Blake, M., Boyle, P., Duke-Williams, O., Rees, P. H., Stillwell, J., & Hugo, G. J. (2002). Cross-national comparison of internal migration: issues and measures. Journal of the Royal Statistical Society: Series A (Statistics in Society), 165(3), 435–464. https://doi.org/10.1111/1467-985X.00247
Bell, M., & Muhidin, S. (2009). Cross-National Comparisons of Internal Migration (Research Paper 2009/30; Human Development Reports).
Bernard, A., Bell, M., & Charles-Edwards, E. (2014). Improved measures for the cross-national comparison of age profiles of internal migration. Population Studies, 68(2), 179–195. https://doi.org/10.1080/00324728.2014.890243
Examples
library(dplyr)
ipumsi_age %>%
filter(sample == "BRA2000") %>%
mutate(mi = migrants/population) %>%
index_age()
ipumsi_age %>%
group_by(sample) %>%
mutate(mi = migrants/population) %>%
index_age(long = FALSE)