-------------------------------------------------------------------------------- Codebook for NHGIS data file 'nhgis_ds104_1980_block_popular.csv' -------------------------------------------------------------------------------- Contents - Data Description - Data Summary - Data Dictionary - Median Computation & Special Codes - Suppression - Citation and Use Additional documentation on NHGIS data sources is available at: https://www.nhgis.org/documentation/tabular-data -------------------------------------------------------------------------------- Data Description -------------------------------------------------------------------------------- The data file accompanying this codebook contains summary data for 1980 census collection blocks derived from 1980 Summary Tape File 1 (STF1). The file includes the 16 tables that are the most popular requested tables from STF1 among NHGIS users. The original STF1 block data was provided only for parts of collection blocks, subdivided by the boundaries of places and minor civil divisions. NHGIS staff generated the data for whole collection blocks from the data for block parts. NHGIS has created this version of 1980 block data to accompany the NHGIS 1980 block boundaries. For more information on the 1980 block boundaries, see https://www.nhgis.org/1980-block-boundaries. For an explanation of the motivation for these files and of the concept of "whole collection blocks," see https://www.nhgis.org/1980-block-boundaries#collection-blocks. To generate data for whole collection blocks for each table, we sum the counts for all separate parts in each split block, producing totaled sums for each whole block. For tables that report median values, summing in this way is not appropriate. Instead, for blocks that are split in the source 1980 STF1 data, we estimate medians from corresponding binned count data from a different table. We use this same method to compute medians for ALL blocks for Table NT44 (Median Contract Rent) because the source values for NT44 are incorrect. For more information on our approach for medians, see the section on Median Computation & Special Codes below. We suppress data for whole collection blocks wherever the STF1 source data were suppressed for any of the individual block parts that compose each whole block. For more information, see the section on Suppression below. -------------------------------------------------------------------------------- Data Summary -------------------------------------------------------------------------------- Year: 1980 Geographic level: Block (by State--County--Census Tract) Dataset: 1980 Census: STF 1 - 100% Data NHGIS code: 1980_STF1 NHGIS ID: ds104 Breakdown(s): Geographic Subarea: Total area (0000) Source geographic levels: Block [MCD states] (by State--Standard Metropolitan Statistical Area--County--County Subdivision--Place--Census Tract) Block [non-MCD states] (by State--Standard Metropolitan Statistical Area--County--Place--Census Tract) Tables: 1. Persons Universe: Persons Source code: NT1A NHGIS code: C7L 2. Urban/Rural Status Universe: Persons Source code: NT1B NHGIS code: C7M 3. Households Universe: Households Source code: NT3 NHGIS code: C75 4. Housing Units Universe: Housing Units Source code: NT4A NHGIS code: C8Y 5. Occupancy Status Universe: Year-Round Housing Units Source code: NT5B NHGIS code: C9B 6. Race Universe: Persons Source code: NT7 NHGIS code: C9D 7. Spanish Origin Universe: Persons Source code: NT8 NHGIS code: C9E 8. Persons of Spanish Origin Universe: Persons of Spanish Origin Source code: NT9A NHGIS code: C9F 9. Race Universe: Persons of Spanish Origin Source code: NT9B NHGIS code: C9G 10. Age Universe: Persons Source code: NT10A NHGIS code: C67 11. Tenure Universe: Occupied Housing Units Source code: NT26B NHGIS code: C7W 12. Tenure by Race of Householder Universe: Occupied Housing Units Source code: NT27B NHGIS code: C7Y 13. Value Universe: Specified Owner-Occupied Noncondominium Housing Units Source code: NT38 NHGIS code: C8I 14. Median Value Universe: Specified Owner-Occupied Noncondominium Housing Units Source code: NT39 NHGIS code: C8J 15. Contract Rent Universe: Specified Renter-Occupied Housing Units Source code: NT43 NHGIS code: C8N 16. Median Contract Rent Universe: Specified Renter-Occupied Housing Units Paying Cash Rent Source code: NT44 NHGIS code: C8O -------------------------------------------------------------------------------- Data Dictionary -------------------------------------------------------------------------------- Context Fields GISJOIN: GIS Join Match Code GEOID: Census Geographic Identifier YEAR: Data File Year FSTATUS: Functional Status Code REGIONA: Region Code DIVISIONA: Division Code STATE: State Name STATEA: State Code SMSA: Standard Metropolitan Statistical Area Name SMSAA: Standard Metropolitan Statistical Area Code COUNTY: County Name COUNTYA: County Code TRACTA: Census Tract Code BLCK_GRPA: Block Group Code BLOCKA: Block Code SCSAA: Standard Consolidated Statistical Area Code SEA: State Economic Area CBD: Central Business District SUPFLG01: Total Population Suppression Flag SUPFLG02: White Population Suppression Flag SUPFLG03: Black Population Suppression Flag SUPFLG04: American Indian, Eskimo, and Aleut Suppression Flag SUPFLG05: Asian and Pacific Islander Suppression Flag SUPFLG06: Spanish Population Suppression Flag SUPFLG07: Spanish-White Population Suppression Flag SUPFLG08: Spanish-Black Population Suppression Flag SUPFLG09: Year-Round Housing Unit Suppression Flag SUPFLG10: Occupied Housing Unit Suppression Flag SUPFLG11: White Householder Suppression Flag SUPFLG12: Black Householder Suppression Flag SUPFLG13: American Indian, Eskimo, and Aleut Householder Suppression Flag SUPFLG14: Asian and Pacific Islander Householder Suppression Flag SUPFLG15: Other Race Householder Suppression Flag SUPFLG16: Owner/Renter Housing Unit Suppression Flag SUPFLG17: Owner Occupied Housing Unit Suppression Flag SUPFLG18: Renter Occupied Housing Unit Suppression Flag SUPFLG19: Spanish Origin Householder Suppression Flag SUPFLG20: Spanish-White Householder Suppression Flag SUPFLG21: Spanish-Black Householder Suppression Flag Breakdown: Geographic Subarea: Total area (0000) Table 1: Persons Universe: Persons Source code: NT1A NHGIS code: C7L C7L001: Total Table 2: Urban/Rural Status Universe: Persons Source code: NT1B NHGIS code: C7M C7M001: Inside urbanized area C7M002: Outside urbanized area C7M003: Rural Table 3: Households Universe: Households Source code: NT3 NHGIS code: C75 C75001: Total Table 4: Housing Units Universe: Housing Units Source code: NT4A NHGIS code: C8Y C8Y001: Total Table 5: Occupancy Status Universe: Year-Round Housing Units Source code: NT5B NHGIS code: C9B C9B001: Occupied C9B002: Vacant Table 6: Race Universe: Persons Source code: NT7 NHGIS code: C9D C9D001: White C9D002: Black C9D003: American Indian, Eskimo, and Aleut: American Indian C9D004: American Indian, Eskimo, and Aleut: Eskimo C9D005: American Indian, Eskimo, and Aleut: Aleut C9D006: Asian and Pacific Islander: Japanese C9D007: Asian and Pacific Islander: Chinese C9D008: Asian and Pacific Islander: Filipino C9D009: Asian and Pacific Islander: Korean C9D010: Asian and Pacific Islander: Asian Indian C9D011: Asian and Pacific Islander: Vietnamese C9D012: Asian and Pacific Islander: Hawaiian C9D013: Asian and Pacific Islander: Guamanian C9D014: Asian and Pacific Islander: Samoan C9D015: Other Table 7: Spanish Origin Universe: Persons Source code: NT8 NHGIS code: C9E C9E001: Not of Spanish origin C9E002: Mexican C9E003: Puerto Rican C9E004: Cuban C9E005: Other Spanish Table 8: Persons of Spanish Origin Universe: Persons of Spanish Origin Source code: NT9A NHGIS code: C9F C9F001: Total Table 9: Race Universe: Persons of Spanish Origin Source code: NT9B NHGIS code: C9G C9G001: White C9G002: Black C9G003: American Indian, Eskimo, Aleut, and Asian and Pacific Islander C9G004: Other Table 10: Age Universe: Persons Source code: NT10A NHGIS code: C67 C67001: Under 1 year C67002: 1-2 years C67003: 3-4 years C67004: 5 years C67005: 6 years C67006: 7-9 years C67007: 10-13 years C67008: 14 years C67009: 15 years C67010: 16 years C67011: 17 years C67012: 18 years C67013: 19 years C67014: 20 years C67015: 21 years C67016: 22-24 years C67017: 25-29 years C67018: 30-34 years C67019: 35-44 years C67020: 45-54 years C67021: 55-59 years C67022: 60-61 years C67023: 62-64 years C67024: 65-74 years C67025: 75-84 years C67026: 85 years and over Table 11: Tenure Universe: Occupied Housing Units Source code: NT26B NHGIS code: C7W C7W001: Owner occupied C7W002: Renter occupied Table 12: Tenure by Race of Householder Universe: Occupied Housing Units Source code: NT27B NHGIS code: C7Y C7Y001: Owner occupied >> White C7Y002: Owner occupied >> Black C7Y003: Owner occupied >> American Indian, Eskimo, and Aleut C7Y004: Owner occupied >> Asian and Pacific Islander C7Y005: Owner occupied >> Other C7Y006: Renter occupied >> White C7Y007: Renter occupied >> Black C7Y008: Renter occupied >> American Indian, Eskimo, and Aleut C7Y009: Renter occupied >> Asian and Pacific Islander C7Y010: Renter occupied >> Other Table 13: Value Universe: Specified Owner-Occupied Noncondominium Housing Units Source code: NT38 NHGIS code: C8I C8I001: Less than $10,000 C8I002: $10,000-$14,999 C8I003: $15,000-$19,999 C8I004: $20,000-$24,999 C8I005: $25,000-$29,999 C8I006: $30,000-$34,999 C8I007: $35,000-$39,999 C8I008: $40,000-$49,999 C8I009: $50,000-$79,999 C8I010: $80,000-$99,999 C8I011: $100,000-$149,999 C8I012: $150,000-$199,999 C8I013: $200,000 or more Table 14: Median Value Universe: Specified Owner-Occupied Noncondominium Housing Units Source code: NT39 NHGIS code: C8J C8J001: Median value Table 15: Contract Rent Universe: Specified Renter-Occupied Housing Units Source code: NT43 NHGIS code: C8N C8N001: With cash rent: Less than $50 C8N002: With cash rent: $50-$99 C8N003: With cash rent: $100-$119 C8N004: With cash rent: $120-$139 C8N005: With cash rent: $140-$149 C8N006: With cash rent: $150-$159 C8N007: With cash rent: $160-$169 C8N008: With cash rent: $170-$199 C8N009: With cash rent: $200-$249 C8N010: With cash rent: $250-$299 C8N011: With cash rent: $300-$399 C8N012: With cash rent: $400-$499 C8N013: With cash rent: $500 or more C8N014: No cash rent Table 16: Median Contract Rent Universe: Specified Renter-Occupied Housing Units Paying Cash Rent Source code: NT44 NHGIS code: C8O C8O001: Median contract rent -------------------------------------------------------------------------------- Median Computation & Special Codes -------------------------------------------------------------------------------- Six tables in 1980 STF1 report median values. To produce statistics for whole collection blocks for these tables, we estimate medians from corresponding binned count data from a different table. For instance, for table NT11A (Median Age), in cases where a single collection block's population was split into multiple STF1 records, we estimate medians for the whole block from the binned counts in table NT10A (Age) after summing each binned count within each collection block. Median tables in 1980 STF1 and the corresponding tables of binned counts: _MEDIAN_TABLE_ _SOURCE_OF_BINNED_COUNTS_ NT11A. Median Age NT10A. Age NT11B. Median Age by Sex NT10B. Sex by Age NT31. Median Rooms NT30. Rooms NT34. Median Persons per Unit NT33A. Persons in Unit NT39. Median Value NT38. Value NT44. Median Contract Rent NT43. Contract Rent We use the median estimation method described in User Note No. 2 of the 1980 STF1 Technical Documentation: https://assets.nhgis.org/original-data/modern-census/1980STF1.pdf#page=9 When computing medians, the Census Bureau often uses count data that is grouped into narrower bins than those reported in 1980 STF1, producing a more precise median estimate. Therefore, for unsplit collection blocks and for split blocks that had nonzero counts in only a single split part, we retain the original median values reported in 1980 STF1. As is also explained in User Note No. 2 (link above), the original values in table NT44 (Median Contract Rent) were incorrect for all blocks, so for that table, we interpolate from counts to generate corrected median values for ALL blocks, both split and unsplit. The 1980 STF1 documentation suggests that medians were computed using Pareto interpolation in some cases, but this seemed inconsistent with the median values reported. Therefore, in contrast to what is suggested in the 1980 STF1 documentation, we use linear interpolation for all medians in this dataset. When all of the binned counts on which a median is based are zeroes, it is impossible to compute a valid median. Where this occurs, we leave the median value blank. When the interpolated median value fell into the lowest or highest count bin, we recoded the reported median using the values shown below. An observation that takes one of these values should be interpreted not as the median value itself, but as an indicator that the median was above or below the indicated bin boundary. This is also described on page 18 (PDF page 31) of the 1980 STF1 Technical Documentation. Median top and bottom codes: Table NT11A: <1.0: 0.9 >85 : 85.1 Table NT11B: <1.0: 0.9 >85 : 85.1 Table NT31: <1.1: 1.0 >5.5: 5.6 Table NT34: <1.01: 1.0 >5.5 : 5.51 Table NT39: <10000 : 9990 >200000: 200100 Table NT44: <50 : 49 >500: 501 -------------------------------------------------------------------------------- Suppression -------------------------------------------------------------------------------- Data from 1980 STF1 include suppression, whereby certain counts for blocks with few people or households were not published. When aggregating data from block parts to whole blocks, we suppress data for a given variable whenever at least one of the component block parts had suppressed data for that variable. Suppressed values are indicated with blanks, but not all blank values are due to suppression; we also leave median variables blank when they are not calculable from the available count data. You can use the SUPFLG fields to help determine whether a value is suppressed or not. 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