Variable list

The variable list provides summary information on variables of the Voyages Database in the "Search the Database" section. The variables are displayed here in the form of short labels. The second column gives their equivalents in the downloadable SPSS version of the database, where variable names take the form of acronyms. These names are also used in downloads of data for listings, tables and graphics from the website.

Variables without an asterisk are "data variables" - information as found in a primary source documenting a slaving voyage. Variables followed by an asterisk are "imputed variables." They include information, such as the mortality rate on slave voyages, that is calculated from data variables as well as information which, although not directly documented, can be supplied on the basis of patterns observed in data variables.

Ship, nation, owners
Variables SPSS Voyages Estimates Basic General Note
Voyage identification number voyageid 35,938
Voyage in 1999 CD-ROM evgreen 26,529
Vessel name shipname 34,288
Flag national 26,386
Flag* natinimp 33,791 Flag regrouped into seven major national carriers
Place constructed placcons 9,155
Year constructed yrcons 6,215
Place registered placreg 7,442
Year registered yrreg 4,887
Rig rig 23,451
Tonnage tonnage 17,629
Standardized tonnage* tonmod 16,682 Converted to pre-1786 British registered tons
Guns mounted guns 6,128
Vessel owners owner 21,336
Voyage Outcome
Variables SPSS Voyages Estimates Basic General Note
Particular outcome of voyage fate 35,938
Outcome of voyage for slaves* fate2 35,938 Derived from particular outcome
Outcome of voyage if ship captured* fate3 35,938 Derived from particular outcome
Outcome of voyage for owner* fate4 35,938 Derived from particular outcome
African resistance resistance 565
Voyage Itinerary
Variables SPSS Voyages Estimates Basic General Note
Place where voyage began* ptdepimp 31,478 Same as data variable in most cases, but derived from port of return for certain Brazilian voyages
First place of slave purchase plac1tra 21,615
Second place of slave purchase plac2tra 2,773
Third place of slave purchase plac3tra 550
Principal place of slave purchase* mjbyptimp 34,298 Place where largest number of captives embarked
Places of call before Atlantic crossing npafttra 1,670
First place of slave landing sla1port 25,584
Second place of slave landing adpsale1 1,260
Third place of slave landing adpsale2 88
Principal place of slave landing* mjslptimp 31,690 Place where largest number of captives embarked
Place where voyage ended portret 10,693
Voyage Dates
Variables SPSS Voyages Estimates Basic General Note
Year arrived with slaves* yearam 35,936 Standard variable for classification by year of voyage
Date voyage began date_dep 26,414
Date trade began in Africa date_buy 8,767
Date vessel departed Africa date_leftAfr 8,166
Date vessel arrived with slaves date_land1 24,238
Date vessel departed for homeport date_depam 6,350
Date voyage completed date_end 11,366
Voyage length, homeport to slaves landing (days)* voy1imp 12,981 Difference between date voyage began and date vessel arrived with slaves
Middle passage (days)* voy2imp 7,064 Difference between date vessel left Africa and date it arrived with slaves
Captain and Crew
Variables SPSS Voyages Estimates Basic General Note
Captain's name captain 31,886
Crew at voyage outset crew1 12,682
Crew at first landing of slaves crew3 2,281
Crew deaths during voyage crewdied 4,449
Slave (numbers)
Variables SPSS Voyages Estimates Basic General Note
Number of slaves intended at first place of purchase slintend 7,281
Slaves carried from first port of purchase ncar13 1,947
Slaves carried from second port of purchase ncar15 1,929
Slaves carried from third port of purchase ncar17 1,923
Total slaves embarked tslavesd 8,267
Total slaves embarked* slaximp 34,360 Estimated embarkations
Number of slaves arriving at first place of landing slaarriv 18,341
Number of slaves disembarked at first place of landing slas32 2,898
Number of slaves disembarked at second place of landing slas36 2,475
Number of slaves disembarked at third place of landing slas39 2,419
Total slaves disembarked* slamimp 34,057 Estimated embarkations
Slave (characteristics)
Variables SPSS Voyages Estimates Basic General Note
Percentage men* menrat7 3,452 Captives identified by age and gender
Percentage women* womrat7 3,452 Captives identified by age and gender
Percentage boys* boyrat7 3,451 Captives identified by age and gender
Percentage girls* girlrat7 3,451 Captives identified by age and gender
Percentage male* malrat7 3,926 Captives identified by gender (males/females)
Percentage children* chilrat7 4,273 Captives identified by age group (adults/children)
Sterling cash price in Jamaica* jamcaspr 963
Slave deaths during middle passage* vymrtimp 6,493 Documented or difference between embarked and disembarked captives (data variables)
Mortality rate* vymrtrat 6,455 Slave deaths during Middle Passage divided by number of captives leaving Africa
Source
Variables SPSS Voyages Estimates Basic General Note
Sources source 35,924
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