{
 "acceptance": true,
 "analysis": {
  "columns": [
   "sepal_length",
   "sepal_width",
   "petal_length",
   "petal_width",
   "species"
  ],
  "difference_ci95_first_pair": [
   -1.102,
   -0.76
  ],
  "duplicate_rows": 1,
  "missing_cells": 0,
  "pairwise_welch": [
   {
    "a": "setosa",
    "b": "versicolor",
    "cohens_d": -2.1042,
    "df": 86.54,
    "p_approx": 0.0,
    "t": -10.521
   },
   {
    "a": "setosa",
    "b": "virginica",
    "cohens_d": -3.0772,
    "df": 76.52,
    "p_approx": 0.0,
    "t": -15.3862
   },
   {
    "a": "versicolor",
    "b": "virginica",
    "cohens_d": -1.1258,
    "df": 94.03,
    "p_approx": 0.0,
    "t": -5.6292
   }
  ],
  "rows": 150,
  "sepal_length_means": {
   "setosa": 5.006,
   "versicolor": 5.936,
   "virginica": 6.588
  },
  "species_counts": {
   "setosa": 50,
   "versicolor": 50,
   "virginica": 50
  }
 },
 "challenges": [
  "pairwise tests are not corrected for multiple comparisons; Bonferroni threshold = 0.0167",
  "Welch's t-test assumes approximate normality; n=50 per species and no outlier screening",
  "p-values use a normal approximation; labelled p_approx, not exact",
  "correlation is not causation; species labels are not an experimental treatment"
 ],
 "conclusion": "Sepal length differs strongly between setosa and the other two species in this dataset; the other comparisons are smaller and must be read with the correction and assumptions stated above.",
 "execution_class": "REAL_EXTERNAL_SOURCE",
 "license_note": "seaborn-data repository (BSD-3-Clause); Iris is a public UCI dataset",
 "limitations": "One small classic dataset; not a general biological claim.",
 "mission": "data_iris",
 "sha256": "9cc1c345c71bcc9b486b74cbf6063fa66f4bb5e0f603a4b3c3471ec2e5e8e355",
 "source": "https://raw.githubusercontent.com/mwaskom/seaborn-data/master/iris.csv",
 "validation": {
  "columns": [
   "sepal_length",
   "sepal_width",
   "petal_length",
   "petal_width",
   "species"
  ],
  "columns_ok": true,
  "duplicate_rows": 1,
  "missing_cells": 0,
  "rows": 150
 },
 "worker_recompute": {
  "rows": 150,
  "sepal_length": {
   "count": 150,
   "max": 7.9,
   "mean": 5.843333,
   "min": 4.3
  }
 }
}