concordance (version 1.6)

sigma: sigma

Description

sigma is used to return trade elasticities (import demand elasticities) for a given product.

Usage

sigma(sourcevar, origin, country="USA", use_SITC=FALSE, give_avg=TRUE)

Arguments

sourcevar

Vector which contains the codes to be converted

origin

Coding scheme of origin (name enclosed in quotes "")

country

Country for which to return import demand elasticity (default=USA)

use_SITC

Set to TRUE if you wish to look up elasticities via SITC instead of HS. Only available for the US.

give_avg

Set to FALSE if you wish to obtain a vector of output elasticities for all matching codes. When set to TRUE (as by default) the output will be a simple average of all elasticities in this vector.

Details

Supports the following classifications: HS, HS0, HS1, HS2, HS3, HS4, ISIC2, ISIC3, SITC1, SITC2, SITC3, SITC4, NAICS

The following strings can be used as arguments for origin: "naics", "hs" (for HS Combined), "hs0" (1988/92), "hs1" (1996), "hs2" (2002), "hs3" (2007), "hs4" (2012), "isic2", "isic3", "sitc1", "sitc2", "sitc3", "sitc4".

Also accepts aggregated (shorter) or disaggregated (longer) codes.

Use ISO3 codes to specify country. Data is available for 74 countries (the US + 73 others.) For a list of available countries, load the package and type "unique(sigmatab$iso3)".

Concords given list of codes to list of SITC3 codes (for the US) or 3-digit HS3 codes (for other countries), then uses this as input to concord to import demand elasticities. Does not differentiate between codes corresponding to different codes in input vector.

You may also wish to look up the getSigma function, which has similar but more specialised functionality, and may work better in some cases.

References

C. Broda and D. Weinstein, "Globalization and the Gains from Variety," Quarterly Journal of Economics Volume 121, Issue 2 - May 2006

Examples

# NOT RUN {
sigma("847", "HS")
# returns [1] 17.48601

sigma("847", "HS", "KOR")
# returns [1] 2.545708

sigma("261", "HS3", "KOR")
# returns [1] 3.071524
# }