Table 4 Most distinguishing words co-occurring with NSF, 1995–2006 to 2007–2018.

Based on sentence-level analysis, in (nontitle) sentences that include a direct mention of the NSF (see Materials and Methods for details on pre-whitening of text). Words in bold are the top five words mentioned over the entire time period. Most distinguishing words for each period are the top 20 diff scores, where for each word w, the following is calculated for the first time period (P) and the second time period (Q), respectively: diffwP=countwP#sentencesPcountwQsentencesQ, and diffwQ=countwQ#sentencesQcountwPsentencesP

Twenty words that distinguish between time periods:
4D. Democrats only:4R. Republicans only:
1995–20062007–20181995–20062007–2018
BudgetProgramYearGrant
EpaEducationProgramInterest
HousingFundFiscalTaxpayer
PlantTechnologyAgencyAccountable
ProvidedBillMillionDollars
HudActSupportSpending
ResolutionDepartmentActMoney
CommitteesGrantFederalAmerican
FiveSupportShallChange
AlmostMathAdministrationClimate
CoastalStandardsBudgetInnovation
ParticularlyTeacherEducationPolitical
PercentEngineeringAuthorizePeople
NsfsInstituteActivityStem
InternetEnergyBasicFunds
NationsShallSectionSpent
GenomeSectionHealthMission
HalfYearEngineeringAwarded
IncreasedBillionFundSure
TimeNistEnvironmentalEarlier