calculateEle111: Calculate Element 111 (Use for Same Product)
In SWS-Methodology/faoswsAupus: Package to perform the AUPUS calculation.

Description Usage Arguments Details Value

This function imputes element 111, which can be thought of as the amount used for seeding. The rules are as follows:

1	calculateEle111(stotal, data, aupusParam)

`stotal`	The column name of data corresponding to the total supply.
`data`	The AUPUS node dataset, typically as produced by buildNodes.
`aupusParam`	A list of running parameters to be used in pulling the data. Typically, this is generated from getAupusParameter (see that function for a description of the required elements).

If Ratio 171 (presumably a seeding ratio) is not available for the current commodity, a similar formula to 101 is used: E_111 = R_111 * (total supply) / 100.
If Ratio 171 is available, then an estimate for total production is used to multiply by Ratio 171 to compute the amount used for seed. The preferred estimate for production value is element 21 (potential producing factor) in the next year; if this is unavailable then element 31 (actual producing factor) in the next year is used; then element 21 in the current year; and lastly element 31 in the current year. The value for element 111 is then filled in as this computed area value times R_171 divided by 1000.

This function returns a list (of length 2) of integer vectors containing the row numbers of observations which were updated (the first vector when a value was computed using ratio 111, the second for when ratio 171 was used). However, it also has a side effect: rows within the passed data.table ("data") have element 111's value and symbol updated.

SWS-Methodology/faoswsAupus documentation built on May 9, 2019, 11:45 a.m.