one year after both adopt bitnet-used in figure 1
two years after both adopt bitnet-used in figure 1
three years after both adopt bitnet-used in figure 1
four years after both adopt bitnet-used in figure 1
year bitnet added in institution 1
year bitnet added in institution 2
more than four years after both adopt bitnet-used in figure 1
total number of collaborative publications in institution-pair year
Distance is under 100 km and Both Adopted Bitnet
Distance is between 100 km and 500 km and Both Adopted Bitnet
Distance is under 250 km and Both Adopted Bitnet
Distance is between 250 km and 1000 km and Both Adopted Bitnet
Distance is between 500 km and 1000 km and Both Adopted Bitnet
Distance is between 1000 km and 3000 km and Both Adopted Bitnet
Distance is over 3000 km and Both Adopted Bitnet
Both have Bitnet
Dummy for any collaborative pubs in institution-pair year--key dependent var
distance between institutions using great circle method
dummy for whether pair collaborate at least once from 1981 to 1991
the exact year both have adopted bitnet-used in figure 1
tier 1-tier 1 pair as defined by 1980 Gorman Report (only 2 tiers defined)
tier 1-tier 2 pair as defined by 1980 Gorman Report (only 2 tiers defined)
tier 2-tier 2 pair as defined by 1980 Gorman Report (only 2 tiers defined)
group(instit1 instit2) for fixed effects
institution 1 has Bitnet
institution 2 has Bitnet
institution 1
institution 2
group(gpinst bothbitnet) for clustering
one year before both adopt bitnet-used in figure 1
two years before both adopt bitnet-used in figure 1
three years before both adopt bitnet-used in figure 1
total collaborations over previous 4 years--includes 1977-1980
Sum of # of electrical engineering doctorates given (lagged)
Sum of R&D in electrical engineering (millions of $, lagged)
Sum of $ NSF grants (lagged)
Sum of # of electrical engineering post-doctoral students present (lagged)
Dummy for only the lower tier school has adopted bitnet
total number of collaborations between pair across all 11 years
Dummy for only one institution in the pair has bitnet
Dummy for errors may be correlated due to social networks
tier1-tier1 pair defined by publications in the data: quartile 1 2 34combined
tier1-tier2 pair defined by publications in the data: quartile 1 2 34combined
tier1-tier3 pair defined by publications in the data: quartile 1 2 34combined
tier2-tier2 pair defined by publications in the data: quartile 1 2 34combined
tier2-tier3 pair defined by publications in the data: quartile 1 2 34combined
tier3-tier3 pair defined by publications in the data: quartile 1 2 34combined
tier1-tier1 pair defined by nsf grants 1977-1980 (3 tiers)
tier1-tier2 pair defined by nsf grants 1977-1980 (3 tiers)
tier1-tier3 pair defined by nsf grants 1977-1980 (3 tiers)
tier2-tier2 pair defined by nsf grants 1977-1980 (3 tiers)
tier2-tier3 pair defined by nsf grants 1977-1980 (3 tiers)
tier3-tier3 pair defined by nsf grants 1977-1980 (3 tiers)
tier1-tier1 pair defined by carnegie foundation 1987 tiers (3 tiers)
tier1-tier2 pair defined by carnegie foundation 1987 tiers (3 tiers)
carnegie 1987 qual defn tier1-tier3
tier2-tier2 pair defined by carnegie foundation 1987 tiers (3 tiers)
tier2-tier3 pair defined by carnegie foundation 1987 tiers (3 tiers)
tier3-tier3 pair defined by carnegie foundation 1987 tiers (3 tiers)
Sum of # of electrical engineering doctorates given in all years combined
Sum of R&D in electrical engineering (millions of $) in all yrs combined
Sum # of electrical engineering post-doctoral students present in all yrs comb
total publications by institution-pair in all years combined
Sum of # of single-institution papers produced by the pair