The plural form of Doctor of Philosophy can be abbreviated as either Ph.D's or PhD's.
There is no standard collective noun for a group of PhDs. Some that are close are a faculty of academics or a pomposity of professors.However, collective nouns are an informal part of language. Any noun the suits the situation can function as a collective noun; for example, a pomposity of PhDs, a profusion of PhDs, a puzzlement of PhDs, etc.
phds,
People with PhDs
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The plural is Ph.Ds or PhDs (people) and the plural possessive is PhDs'.(the abbreviation with a period or periods is normally used after a name)
Los alamos
According to data from the OECD, Switzerland has one of the highest rates of PhD attainment per capita, with approximately 2.5 doctorate holders per 1,000 individuals. Other countries with high per capita numbers of PhDs include Sweden, Germany, and the United States.
Yes, Purdue offers PhDs.
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As of 2011 (the latest numbers that have been released), there were a total of 48,068 PhDs awarded in the United States. Of this number, 11,467 PhDs were awarded in the Life Sciences area.
Little more than 1% of Americans have PhDs.
Well over a thousand Kenyans hold PhDs in various felds.