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 35,997
Voyage in 1999 CD-ROM evgreen 26,507
Vessel name shipname 34,350
Flag national 26,462
Flag* natinimp 33,815 Flag regrouped into seven major national carriers
Place constructed placcons 9,183
Year constructed yrcons 6,240
Place registered placreg 7,464
Year registered yrreg 4,901
Rig rig 23,495
Tonnage tonnage 17,662
Standardized tonnage* tonmod 16,697 Converted to pre-1786 British registered tons
Guns mounted guns 6,165
Vessel owners owner 21,379
Voyage Outcome
Variables SPSS Voyages Estimates Basic General Note
Particular outcome of voyage fate 35,997
Outcome of voyage for slaves* fate2 35,997 Derived from particular outcome
Outcome of voyage if ship captured* fate3 35,997 Derived from particular outcome
Outcome of voyage for owner* fate4 35,997 Derived from particular outcome
African resistance resistance 569
Voyage Itinerary
Variables SPSS Voyages Estimates Basic General Note
Place where voyage began* ptdepimp 31,524 Same as data variable in most cases, but derived from port of return for certain Brazilian voyages
First place of slave purchase plac1tra 21,746
Second place of slave purchase plac2tra 2,787
Third place of slave purchase plac3tra 552
Principal place of slave purchase* mjbyptimp 34,316 Place where largest number of captives embarked
Places of call before Atlantic crossing npafttra 1,680
First place of slave landing sla1port 25,616
Second place of slave landing adpsale1 1,271
Third place of slave landing adpsale2 86
Principal place of slave landing* mjslptimp 31,731 Place where largest number of captives embarked
Place where voyage ended portret 10,705
Voyage Dates
Variables SPSS Voyages Estimates Basic General Note
Year arrived with slaves* yearam 35,997 Standard variable for classification by year of voyage
Date voyage began date_dep 26,463
Date trade began in Africa date_buy 8,825
Date vessel departed Africa date_leftAfr 8,104
Date vessel arrived with slaves date_land1 24,278
Date vessel departed for homeport date_depam 6,358
Date voyage completed date_end 11,376
Voyage length, homeport to slaves landing (days)* voy1imp 13,006 Difference between date voyage began and date vessel arrived with slaves
Middle passage (days)* voy2imp 7,083 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 31,940
Crew at voyage outset crew1 12,717
Crew at first landing of slaves crew3 2,281
Crew deaths during voyage crewdied 4,450
Slave (numbers)
Variables SPSS Voyages Estimates Basic General Note
Number of slaves intended at first place of purchase slintend 7,294
Slaves carried from first port of purchase ncar13 1,957
Slaves carried from second port of purchase ncar15 1,889
Slaves carried from third port of purchase ncar17 1,871
Total slaves embarked tslavesd 8,285
Total slaves embarked* slaximp 34,034 Estimated embarkations
Number of slaves arriving at first place of landing slaarriv 18,347
Number of slaves disembarked at first place of landing slas32 2,941
Number of slaves disembarked at second place of landing slas36 2,446
Number of slaves disembarked at third place of landing slas39 2,365
Total slaves disembarked* slamimp 33,722 Estimated embarkations
Slave (characteristics)
Variables SPSS Voyages Estimates Basic General Note
Percentage men* menrat7 3,466 Captives identified by age and gender
Percentage women* womrat7 3,465 Captives identified by age and gender
Percentage boys* boyrat7 3,457 Captives identified by age and gender
Percentage girls* girlrat7 3,452 Captives identified by age and gender
Percentage male* malrat7 3,938 Captives identified by gender (males/females)
Percentage children* chilrat7 4,186 Captives identified by age group (adults/children)
Sterling cash price in Jamaica* jamcaspr 954
Slave deaths during middle passage* vymrtimp 6,459 Documented or difference between embarked and disembarked captives (data variables)
Mortality rate* vymrtrat 6,423 Slave deaths during Middle Passage divided by number of captives leaving Africa
Source
Variables SPSS Voyages Estimates Basic General Note
Sources source 35,983
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