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 35,994
Voyage in 1999 CD-ROM evgreen 26,509
Vessel name shipname 34,347
Flag national 26,460
Flag* natinimp 33,816 Flag regrouped into seven major national carriers
Place constructed placcons 9,183
Year constructed yrcons 6,241
Place registered placreg 7,466
Year registered yrreg 4,901
Rig rig 23,492
Tonnage tonnage 17,660
Standardized tonnage* tonmod 16,712 Converted to pre-1786 British registered tons
Guns mounted guns 6,165
Vessel owners owner 21,365
Voyage Outcome
Variables SPSS Voyages Estimates Basic General Note
Particular outcome of voyage fate 35,994
Outcome of voyage for slaves* fate2 35,994 Derived from particular outcome
Outcome of voyage if ship captured* fate3 35,994 Derived from particular outcome
Outcome of voyage for owner* fate4 35,994 Derived from particular outcome
African resistance resistance 568
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 21,731
Second place of slave purchase plac2tra 2,784
Third place of slave purchase plac3tra 552
Principal place of slave purchase* mjbyptimp 34,318 Place where largest number of captives embarked
Places of call before Atlantic crossing npafttra 1,679
First place of slave landing sla1port 25,607
Second place of slave landing adpsale1 1,271
Third place of slave landing adpsale2 86
Principal place of slave landing* mjslptimp 31,729 Place where largest number of captives embarked
Place where voyage ended portret 10,702
Voyage Dates
Variables SPSS Voyages Estimates Basic General Note
Year arrived with slaves* yearam 35,994 Standard variable for classification by year of voyage
Date voyage began date_dep 26,457
Date trade began in Africa date_buy 8,819
Date vessel departed Africa date_leftAfr 8,109
Date vessel arrived with slaves date_land1 24,268
Date vessel departed for homeport date_depam 6,354
Date voyage completed date_end 11,370
Voyage length, homeport to slaves landing (days)* voy1imp 13,004 Difference between date voyage began and date vessel arrived with slaves
Middle passage (days)* voy2imp 7,082 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 31,939
Crew at voyage outset crew1 12,718
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 1,954
Slaves carried from second port of purchase ncar15 1,889
Slaves carried from third port of purchase ncar17 1,871
Total slaves embarked tslavesd 8,284
Total slaves embarked* slaximp 34,087 Estimated embarkations
Number of slaves arriving at first place of landing slaarriv 18,347
Number of slaves disembarked at first place of landing slas32 2,940
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 33,773 Estimated embarkations
Slave (characteristics)
Variables SPSS Voyages Estimates Basic General Note
Percentage men* menrat7 3,465 Captives identified by age and gender
Percentage women* womrat7 3,464 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 4,192 Captives identified by age group (adults/children)
Sterling cash price in Jamaica* jamcaspr 957
Slave deaths during middle passage* vymrtimp 6,466 Documented or difference between embarked and disembarked captives (data variables)
Mortality rate* vymrtrat 6,430 Slave deaths during Middle Passage divided by number of captives leaving Africa
Source
Variables SPSS Voyages Estimates Basic General Note
Sources source 35,980
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