Thanks, Marco, but that doesn't quite do the trick.

It works on the schematic data I produced, which for simplicity showed all numerics in the second position of level 2.

But in fact, if you are looking at something like all the attributes of a country, some returned info is a String (the country name), another a graphic (the flag), another a number (the GDP) and (sadly!) another Missing[].

Your solution would work if there were a MissingQ[] function, which I could Not[]. But it appears there isn't one.

Regards

Brad

Say we use

{# , CountryData["Montenegro", #]} & /@ CountryData["Montenegro", "Properties"][[1 ;; 14]]

and obtain

{{"AdultPopulation", Quantity[431742., "People"]}, {"AgriculturalProducts", {"Cereals", "Citrus", "Grapes", "Olives", "Potatoes", "Sheep", "Tobacco"}}, {"AgriculturalValueAdded",
Quantity[3.84878*10^8, ("USDollars")/("Years")]}, {"Airports", 5}, {"AlternateNames", {}}, {"AlternateStandardNames", {}}, \ {"AMRadioStations", Missing["NotAvailable"]}, {"AnnualBirths",
Quantity[7137., ("People")/("Years")]}, {"AnnualDeaths",
Quantity[6564., ("People")/("Years")]}, {"AnnualHIVAIDSDeaths",
Missing["NotAvailable"]}, {"ArableLandArea", Quantity[1842.9, ("Kilometers")^2]}, {"ArableLandFraction", 0.137}, {"Area", Quantity[13812., ("Kilometers")^2]}, {"BirthRateFraction", Quantity[0.01114, ("People")/("People" "Years")]}}

That appears to have the structure you are taking about. The second function I suggested:

DeleteCases[{# , CountryData["Montenegro", #]} & /@ CountryData["Montenegro", "Properties"][[1 ;; 10]], {_, _Missing}]

gives

{{"AdultPopulation", Quantity[431742., "People"]}, {"AgriculturalProducts", {"Cereals", "Citrus", "Grapes", "Olives", "Potatoes", "Sheep", "Tobacco"}}, {"AgriculturalValueAdded",
Quantity[3.84878*10^8, ("USDollars")/("Years")]}, {"Airports", 5}, {"AlternateNames", {}}, {"AlternateStandardNames", {}}, \ {"AnnualBirths", Quantity[7137., ("People")/("Years")]}, {"AnnualDeaths", Quantity[6564., ("People")/("Years")]}, {"ArableLandArea", Quantity[1842.9, ("Kilometers")^2]}, {"ArableLandFraction", 0.137}, {"Area", Quantity[13812., ("Kilometers")^2]}, {"BirthRateFraction", Quantity[0.01114, ("People")/("People" "Years")]}}

which appears to have all the Missing items deleted. I think it would help to have an example. It does appear to delete the whole level, but I still might misunderstand the problem.

Cheers, Marco

Ok, sorry for the moot second post. Had not seen your reply.

Best wishes, Marco