The construct() function can be called either with the data.frame as the first argument or the formula and then specify `data=<data.frame>`
construct(data, formula = guess_structure(data), fill = NA,
name_axes = TRUE)
A structured array
A data frame
A formula: value ~ axis1 [+ axis2 + axis n ..]
Value to fill array with if undefined
Keep column names of `data` as axis names