{
  "title": "American Flag and Open-Text Sentiment: Synthetic Known-Effect Evaluation",
  "design": "Two-arm randomized synthetic survey experiment",
  "sampleSize": 1000,
  "allocation": {
    "No image": 500,
    "American flag": 500
  },
  "prompt": "What does being American mean to you?",
  "controlStimulus": null,
  "treatmentStimulus": {
    "file": "american-flag.svg",
    "alt": "Flag of the United States",
    "source": "https://upload.wikimedia.org/wikipedia/en/a/a4/Flag_of_the_United_States.svg",
    "reference": "https://www.usa.gov/flag"
  },
  "outcome": "VADER compound sentiment score",
  "estimand": "Mean VADER score in American-flag arm minus mean VADER score in no-image arm",
  "disclosure": "Responses are synthetic. The positive response pattern was assigned with probability 0.75 in treatment and 0.15 in control. This is a pipeline-recovery evaluation, not a human behavioral experiment.",
  "seed": "conjoint-survey-american-flag-vader-v1"
}