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 36,002
Voyage in 1999 CD-ROM evgreen 26,507
Vessel name shipname 34,353
Flag national 26,465
Flag* natinimp 33,822 Flag regrouped into seven major national carriers
Place constructed placcons 9,183
Year constructed yrcons 6,243
Place registered placreg 7,464
Year registered yrreg 4,901
Rig rig 23,584
Tonnage tonnage 17,663
Standardized tonnage* tonmod 16,698 Converted to pre-1786 British registered tons
Guns mounted guns 6,167
Vessel owners owner 21,383
Voyage Outcome
Variables SPSS Voyages Estimates Basic General Note
Particular outcome of voyage fate 36,002
Outcome of voyage for slaves* fate2 36,002 Derived from particular outcome
Outcome of voyage if ship captured* fate3 36,002 Derived from particular outcome
Outcome of voyage for owner* fate4 36,002 Derived from particular outcome
African resistance resistance 569
Voyage Itinerary
Variables SPSS Voyages Estimates Basic General Note
Place where voyage began* ptdepimp 31,526 Same as data variable in most cases, but derived from port of return for certain Brazilian voyages
First place of slave purchase plac1tra 21,754
Second place of slave purchase plac2tra 2,787
Third place of slave purchase plac3tra 552
Principal place of slave purchase* mjbyptimp 34,319 Place where largest number of captives embarked
Places of call before Atlantic crossing npafttra 1,680
First place of slave landing sla1port 25,617
Second place of slave landing adpsale1 1,272
Third place of slave landing adpsale2 86
Principal place of slave landing* mjslptimp 31,734 Place where largest number of captives embarked
Place where voyage ended portret 10,706
Voyage Dates
Variables SPSS Voyages Estimates Basic General Note
Year arrived with slaves* yearam 36,002 Standard variable for classification by year of voyage
Date voyage began date_dep 26,465
Date trade began in Africa date_buy 8,829
Date vessel departed Africa date_leftAfr 8,103
Date vessel arrived with slaves date_land1 24,279
Date vessel departed for homeport date_depam 6,358
Date voyage completed date_end 11,376
Voyage length, homeport to slaves landing (days)* voy1imp 13,008 Difference between date voyage began and date vessel arrived with slaves
Middle passage (days)* voy2imp 7,084 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 31,943
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 1,957
Slaves carried from second port of purchase ncar15 1,889
Slaves carried from third port of purchase ncar17 1,871
Total slaves embarked tslavesd 8,286
Total slaves embarked* slaximp 34,025 Estimated embarkations
Number of slaves arriving at first place of landing slaarriv 18,347
Number of slaves disembarked at first place of landing slas32 2,943
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 33,713 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 4,181 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 35,988
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