Block Output Share (BOS)
Block Output Share measures the proportion of total research output contributed by each ownership category in South-South Nigeria. In this study, the blocks are federal, state, and private universities. The metric is calculated by dividing the total number of documents produced within a block by the total number of documents produced by all universities, then multiplying by 100. In simple terms, BOS shows how much each category of university contributes to the region's total publication output.
Formula
BOS = (Documents in Block / Total Documents) × 100
Usefulness
- Shows the contribution of each ownership category to regional output.
- Useful for policy and system-level comparison.
- Helps identify where output is concentrated.
Strengths
- Simple percentage-based measure.
- Useful for ownership-level analysis.
- Easy to explain to policy audiences.
Limitations
- Does not compare individual universities directly.
- Can be driven by block size.
- Does not reflect efficiency or annual productivity.
Ranking table
| Overall Rank | Block | Number of Institutions | Number of Documents | Number of Authors | BOS(Block Share) |
|---|---|---|---|---|---|
| 1 | Federal Universities | 7 | 27,970 | 13,454 | 68.64% |
| 2 | State Universities | 12 | 11,730 | 5,520 | 28.79% |
| 3 | Private Universities | 5 | 1,046 | 505 | 2.57% |
Note: Values represent the share of total Scopus indexed documents contributed by each institutional block. Data were extracted from the Scopus database and were accurate as of 12 pm, 9 February 2026.
Derived from the doctoral research of Valentine Joseph Owan on university research performance in South-South Nigeria, University of Calabar, 2026.