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61 lines
1.9 KiB
R
61 lines
1.9 KiB
R
% Generated by roxygen2: do not edit by hand
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% Please edit documentation in R/g.test.R
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\name{ratio}
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\alias{ratio}
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\title{Transform vector to ratio}
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\usage{
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ratio(x, ratio)
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}
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\arguments{
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\item{x}{vector of values}
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\item{ratio}{vector with ratios of \code{x} and with same length (like \code{ratio = c(1, 2, 1)}) or a text with characters \code{":"}, \code{"-"} or \code{","} (like \code{ratio = "1:2:1"} or even \code{ratio = "1:2:1.25"})}
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}
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\description{
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Transform vector to ratio
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}
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\examples{
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# = EXAMPLE 1 =
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# Shivrain et al. (2006) crossed clearfield rice (which are resistant
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# to the herbicide imazethapyr) with red rice (which are susceptible to
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# imazethapyr). They then crossed the hybrid offspring and examined the
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# F2 generation, where they found 772 resistant plants, 1611 moderately
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# resistant plants, and 737 susceptible plants. If resistance is controlled
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# by a single gene with two co-dominant alleles, you would expect a 1:2:1
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# ratio.
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x <- c(772, 1611, 737)
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E <- ratio(x, "1:2:1")
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E
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# 780 1560 780
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G <- g.test(x, p = c(1, 2, 1) / 4)
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# G$p.value = 0.12574.
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# There is no significant difference from a 1:2:1 ratio.
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# Meaning: resistance controlled by a single gene with two co-dominant
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# alleles, is plausible.
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# = EXAMPLE 2 =
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# Red crossbills (Loxia curvirostra) have the tip of the upper bill either
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# right or left of the lower bill, which helps them extract seeds from pine
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# cones. Some have hypothesized that frequency-dependent selection would
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# keep the number of right and left-billed birds at a 1:1 ratio. Groth (1992)
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# observed 1752 right-billed and 1895 left-billed crossbills.
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x <- c(1752, 1895)
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g.test(x)
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# p = 0.01787343
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# There is a significant difference from a 1:1 ratio.
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# Meaning: there are significantly more left-billed birds.
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}
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\references{
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McDonald, J.H. 2014. \strong{Handbook of Biological Statistics (3rd ed.)}. Sparky House Publishing, Baltimore, Maryland.
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}
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\seealso{
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\code{\link{g.test}}
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}
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