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I collected data on income in some countries and found that (all) the income data is close to each other.

I am not sure that the expression "is close to each other" in the sentence above I created is correct. I use data as a singular mass noun.

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Even if you are using data as a singular mass noun, each other can only be used when there is a plurality of subjects.

Therefore, only the following versions can be correct:

  1. The income data is close to itself.
    The income datum is close to itself.

These are grammatical, even if something being "close to itself" is strange. It would likely be rephrased, but the sentence is syntactically sound.

  1. The income data are close to each other.
    The points of the income data are close to each other.
    The income data values are close to each other.
    The income datums are closed to each other.

Those are four variations of the plural use. I provided the extra examples as alternatives to using just data.

Note that datums, while obscure, is still a valid plural form of the singular datum. However, since it is obscure, you might want to avoid it.


Now, consider the following:

My body is long. [singular body]

but

The arms of my body are long. [plural arms]

Finally, look again at the second version of the sentence I used in the plural case:

The points of the income data are close to each other.

It's deliberately vague. You could interpret the income data as either singular or plural—and it wouldn't make any difference to the rest of the sentence, because the plural are goes with the plural points.

This particular construction may best match your need for a singular mass noun interpretation of data while still preserving the idea of it containing, or being spread across, several points.

  • You said "It's deliberately vague". I would like to remove the vagueness. I think this sentence may be interpreted that the points of the income data regarding one country are close to each other to form a straight line graph like y = a constant value. How about "the income data is similar among all the countries" ? – rama9 Jun 30 at 18:35
  • @rama9 I was speaking of the syntax. There is no way of knowing if the income data is singular or plural; but, it doesn't matter. Regardless of interpretation, because it's preceded by a plural noun, the version of the sentence remains grammatical. – Jason Bassford Supports Monica Jun 30 at 20:38

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