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nation
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The name of the country (character). The former USSR is listed here as Russia.
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ctry
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ISO 31661- alpha-2 two-letter country codes (character).
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firstTest
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Date of first test of a nuclear weapon.
For Israel, which has not publicly acknowledged that it has nuclear weapons, this uses the Date of the Vela Incident.
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firstTestYr
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lubridate::decimal_date(firstTest)
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yearsSinceLastFirstTest
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c(NA, diff(firstTestYr))
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nuclearWeapons
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number of nuclear weapons
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nYieldNA, nLowYield, nMidYield, nHighYield
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number of weapons for which the yield in (nYieldNA) = unknown or variable, (nLowYield) = at most 15 kt (kilotons), the size of the Hiroshima bomb, (nMidYield) = greater than 15 but less that 50 kt, and (nHighYield) = at least 50 kt.
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popM, popYr
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popM = estimated population in millions for year popYr, per the Wikipedia article for the indicated country on 2020-02-05.
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GDP_B, GDPyr
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GDP_B = nominal Gross Domestic Product in billions of US dollars for year GDPyr, per the Wikipedia article for the indicated country on 2020-02-05.
