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 35,942
Voyage in 1999 CD-ROM evgreen 26,528
Vessel name shipname 34,293
Flag national 26,391
Flag* natinimp 33,794 Flag regrouped into seven major national carriers
Place constructed placcons 9,160
Year constructed yrcons 6,220
Place registered placreg 7,445
Year registered yrreg 4,890
Rig rig 23,453
Tonnage tonnage 17,634
Standardized tonnage* tonmod 16,686 Converted to pre-1786 British registered tons
Guns mounted guns 6,129
Vessel owners owner 21,339
Voyage Outcome
Variables SPSS Voyages Estimates Basic General Note
Particular outcome of voyage fate 35,942
Outcome of voyage for slaves* fate2 35,942 Derived from particular outcome
Outcome of voyage if ship captured* fate3 35,942 Derived from particular outcome
Outcome of voyage for owner* fate4 35,942 Derived from particular outcome
African resistance resistance 565
Voyage Itinerary
Variables SPSS Voyages Estimates Basic General Note
Place where voyage began* ptdepimp 31,482 Same as data variable in most cases, but derived from port of return for certain Brazilian voyages
First place of slave purchase plac1tra 21,642
Second place of slave purchase plac2tra 2,776
Third place of slave purchase plac3tra 550
Principal place of slave purchase* mjbyptimp 34,302 Place where largest number of captives embarked
Places of call before Atlantic crossing npafttra 1,670
First place of slave landing sla1port 25,591
Second place of slave landing adpsale1 1,264
Third place of slave landing adpsale2 88
Principal place of slave landing* mjslptimp 31,696 Place where largest number of captives embarked
Place where voyage ended portret 10,697
Voyage Dates
Variables SPSS Voyages Estimates Basic General Note
Year arrived with slaves* yearam 35,942 Standard variable for classification by year of voyage
Date voyage began date_dep 26,420
Date trade began in Africa date_buy 8,768
Date vessel departed Africa date_leftAfr 8,172
Date vessel arrived with slaves date_land1 24,243
Date vessel departed for homeport date_depam 6,351
Date voyage completed date_end 11,370
Voyage length, homeport to slaves landing (days)* voy1imp 12,986 Difference between date voyage began and date vessel arrived with slaves
Middle passage (days)* voy2imp 7,069 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 31,888
Crew at voyage outset crew1 12,684
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 7,287
Slaves carried from first port of purchase ncar13 1,945
Slaves carried from second port of purchase ncar15 1,885
Slaves carried from third port of purchase ncar17 1,871
Total slaves embarked tslavesd 8,267
Total slaves embarked* slaximp 34,362 Estimated embarkations
Number of slaves arriving at first place of landing slaarriv 18,346
Number of slaves disembarked at first place of landing slas32 2,901
Number of slaves disembarked at second place of landing slas36 2,442
Number of slaves disembarked at third place of landing slas39 2,372
Total slaves disembarked* slamimp 34,043 Estimated embarkations
Slave (characteristics)
Variables SPSS Voyages Estimates Basic General Note
Percentage men* menrat7 3,453 Captives identified by age and gender
Percentage women* womrat7 3,453 Captives identified by age and gender
Percentage boys* boyrat7 3,452 Captives identified by age and gender
Percentage girls* girlrat7 3,452 Captives identified by age and gender
Percentage male* malrat7 3,925 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 6,496 Documented or difference between embarked and disembarked captives (data variables)
Mortality rate* vymrtrat 6,459 Slave deaths during Middle Passage divided by number of captives leaving Africa
Source
Variables SPSS Voyages Estimates Basic General Note
Sources source 35,928
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