5,640 rated or chosen profiles from 235 respondents, in up to 8 tasks of 3 profiles varying on 5 attributes.
| Description | Discrete choice experiment: 235 Nigerian households (Ondo and Oyo States, 2022) chose among two biofortified gari options (vitamin A, iron, starch, breeding method: conventional, genetic modification or gene editing, price) and a status-quo gari, after nutrition information with or without scientific-method information. 8 tasks each; choice. |
|---|---|
| Reference | Akinwehinmi, T. O., Gassler, B., & Teuber, R. (2026). Consumer preferences for genetically engineered foods in Nigeria: Does process information matter? Q Open. |
| DOI | 10.1093/qopen/qoag007 |
| Licence | CC BY-NC 4.0 |
| Source data | https://doi.org/10.22029/jlupub-20740 |
These notes describe the source data, which the IRW reproduces as released. All notes are listed on the Data Notes page.
| Respondents | 235 |
|---|---|
| Rows (one per respondent, task and profile) | 5,640 |
| Tasks per respondent (most) | 8 |
| Profiles per task | 3 |
| Attributes | 5 |
| Tasks with no profile chosen | 0 |
| Topic | consumer products |
|---|---|
| A profile represents | product service |
| Country | NG |
| Language shown | en, yo |
| Language of stored levels | en |
| Randomization restrictions | yes (stated by the source): article: biofortified options have at least 60% vitamin A and conventionally bred options have 0% iron; D-efficient idefix design, 16 tasks in 2 blocks of 8, status quo fixed (price 300, no VA/iron) |
| Task order | inferred from row order |
| Profile position | recorded in the deposit |
Because the attribute levels were not randomized independently, an estimator has to account for the restriction; a plain difference in means across levels can mislead. Task order or profile position was rebuilt from row order; analyses of position or task order should leave it out.
Outcomes:
| choice | Which gari alternative the respondent chose among Option 1, Option 2 and Option 3 (wording not given in the source) (paraphrase) [choice, forced] |
|---|
attr_breeding_methodattr_ironattr_priceattr_starchattr_vitamin_achoicecov_agecov_educationcov_gendercov_locationidprofiletasktrial_blocktrial_info_arm
The layout (one row per respondent, task and profile; choice/rating outcomes; attr_ columns holding each attribute level as displayed) is defined in the IRW conjoint standard. What the outcomes asked is under Design above.
Licence: CC BY-NC 4.0 — non-commercial use only.
Or load it directly in R or Python (both need a free Redivis account; the first call opens a browser to sign in):
# R
install.packages("remotes")
remotes::install_github("itemresponsewarehouse/Rpkg")
library(irw)
df <- irw_fetch("akinwehinmi_2026_gari_biofortified", source = "conj")
# Python
pip install irw
import irw
df = irw.fetch("akinwehinmi_2026_gari_biofortified", source="conj")
@article{Akinwehinmi_2026, title={Consumer preferences for genetically engineered foods in Nigeria: does process information matter?}, volume={6}, ISSN={2633-9048}, url={http://dx.doi.org/10.1093/qopen/qoag007}, DOI={10.1093/qopen/qoag007}, number={1}, journal={Q Open}, publisher={Oxford University Press (OUP)}, author={Akinwehinmi, Titilayo and Gassler, Birgit and Teuber, Ramona}, year={2026} }
| IRW version | v584 |
|---|---|
| Redivis dataset | irw_conjoint_2 v1.4 |
| Redivis dataset DOI | 10.57761/hk97-wv30 |
| Manifest pin for this IRW version | v1.4 |
| Metadata source | irw_meta v44.0 |