n_jkq.: Calculates the number of answers by a specific linguistic of...
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Calculates the number of answers by a specific linguistic of a sub-item

1	n_jkq.(x, varindex, q, p_ind = rep(1, nrow(x)))

`x`	the data set to evaluate.
`varindex`	index of a particular sub-item.
`q`	index of a particular linguistic term.
`p_ind`	a vector of the relative sampling weights of the units, for which length(p_ind) = nrow(data). If the weights are not relative, the following expression should be applied on the vector: \frac{p_{ind}}{∑_{i=1}^{n} p_{ind}}. If no sampling weights are used, the vector of weights is reduced to a vector of values 1, i.e. rep(1, nrow(data)).