citation.counts: Counts TCATA Citations and Observations for a Product and a...
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citation.counts

R Documentation

Counts TCATA Citations and Observations for a Product and a Comparison Set

Description

Calculates how many times a specified product was checked and how many times a comparison set was checked. The number of evaluations for the product and comparison set are also calculated, along with a reference and decluttering matrix for plotting in tcata.line.plot.

Usage

citation.counts(x, product.name = "", product.col = 1,
attribute.col = 2, results.col = NULL, comparison = "average")

Arguments

`x`	matrix of TCATA 0/1 data with (Assessors x Products x Reps x Attributes) in rows with row headers and (Times) in columns
`product.name`	name of the product for which to calculate how many times a product was checked and not checked
`product.col`	index of column in `x` that contains the product identities
`attribute.col`	index of column in `x` that contains the attribute identities
`results.col`	indices of columns in `x` that contain the raw (0/1) data
`comparison`	specifies whether the comparison will be with the average of all products (`"average"` (default)) or with the average of the other products (`"other"`, i.e. excludes the product specified by `product.name`)

Value

list object with three elements:

P1 matrix of counts for product specified by product.name (attributes are in rows; times are in columns).
Pn number of observations for product.name
C1 matrix of counts for comparison set specified by comparison (dimensions equal to P1.
Cn number of observations for the comparison set defined by comparison
ref a matrix of citation proportions for the comparison set specified by comparison (dimensions equal to P1; can be used to draw a reference line; see tcata.line.plot
declutter a matrix for decluttering in a line plot (dimensions equal to P1; see get.decluttered

References

Castura, J.C., Antúnez, L., Giménez, A., Ares, G. (2016). Temporal check-all-that-apply (TCATA): A novel temporal sensory method for characterizing products. Food Quality and Preference, 47, 79-90. \Sexpr[results=rd]{tools:::Rd_expr_doi("10.1016/j.foodqual.2015.06.017")}

Meyners, M., Castura, J.C. (2018). The analysis of temporal check-all-that-apply (TCATA) data. Food Quality and Preference, 67, 67-76. \Sexpr[results=rd]{tools:::Rd_expr_doi("10.1016/j.foodqual.2017.02.003")}

Examples

# example using 'ojtcata' data set
data(ojtcata)

# comparison of Orange Juice 3 vs. all other OJs (1, 2, 4, 5, 6)
oj3.v.other <- citation.counts(ojtcata, product.name = "3", product.col = 2,
       attribute.col = 4, results.col = 5:25, comparison = "other")

# show results
oj3.v.other

times <- get.times(colnames(ojtcata)[-c(1:4)])
attributes <- unique(ojtcata$attribute)
palettes <- make.palettes(length(attributes))

# plot results
tcata.line.plot(oj3.v.other$P1, n = oj3.v.other$Pn,
   attributes = attributes, times = times,
   line.col = palettes$pal, reference = oj3.v.other$ref, ref.lty = 3,
   declutter = oj3.v.other$declutter, highlight = TRUE, highlight.lwd = 4,
   highlight.col = palettes$pal.light,
   height = 7, width = 11, legend.cex = 0.7, main = "Product 3 vs. Other Products")

tempR documentation built on May 29, 2024, 12:33 p.m.