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Discover Ludwig"are sparse" is correct and usable in written English.
You can use "are sparse" when referring to a limited or scarce quantity of something. For example: "The available resources for the project are sparse, so we must be creative with our solutions."
Dictionary
are sparse
adjective
Having widely spaced intervals.
synonyms
Exact(60)
But others say the clues are sparse and unconvincing.
In addition, "data on the Ph.D. process differentiated by gender are sparse".
Positions for senior scientists and permanent positions, however, are sparse; basically resulting from the regulations imposed by the German BAT.
However, data on these parameters are sparse.
Longitudinal data on adult asthma are sparse.
The discovery could be of great benefit to meteorologists and hydrologists, the team argues, because direct measurements of snowpack are sparse and difficult to obtain.
Data are sparse, but there are some out there, and we'll do our best to pull them together and figure out what they means.
Moonquakes are sparse and feeble, the moon's impact-shattered crust garbles any seismic signals, and computers of that era couldn't handle the complete data set.
Related researches in uncertain environment are sparse.
Data on this trade however are sparse.
However, high quality studies are sparse.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com