zygo_recode: Zygocity - recode variables

In LCBC-UiO/Questionnaires: Package with functions to calculate components and sums for LCBC questionnaires

Zygocity - recode variables

Description

Coding

"Form value" is the value the answer option has in the data file. "Score value" is the value used in the algorithm when zygocity is calculated.

Variable	Answer option	Form value	Score value
Drop	Like two drops of water	1	1
	Like most siblings	2	-1
	Don't know	3	0
Stranger	Often	1	1
	Occasionally	2	0
	Never	3	-1
	Don't know	4	0
Belief	Monozygotic	1	1
	Dizygotic	2	-1
	Don't know	3	0
Eye, Voice & Dexter	Exactly the same	1	1
	Almost like	2	0
	Different	3	-1
	Don't know	4	0

No answer option is used directly in the calculations, only the score values. In the following, it is these values (-1, 0 or 1) that are used in the algorithms. E.g. has Drop in the formula value 1 for a positive answer to whether the twins were equal to two drops of water.

Usage

zygo_recode(x, type)

Arguments

x	vector of numbers, either 1:3 or 1:4
type	Type of question to recode. Can either be 05, 06, 07 or 08, or drop, stranger, dexterity, voice, eye or belief.

Value

return a vector with 0, -1 or 1.

Examples

zygo_recode(c(1:4, NA), type = "eye")
zygo_recode(c(1:4, NA), type = "voice")
zygo_recode(c(1:3, NA), type = "drop")

LCBC-UiO/Questionnaires documentation built on July 18, 2023, 6:45 p.m.