Source: This data set is from a study published in 1757, A Treatise on the Scurvy, by James Lind.
The dataset is derived directly from pages 149-153 of this tome, which includes the description of a small, randomized, comparator-controlled 6 day clinical trial of 6 scurvy remedies in 12 seamen with scurvy. The particpant_id variable, and the Likert scales for each outcome measured in this reconstructed dataset, are a bit fanciful (as Likert was not even born in 1757), but match Lindโs descriptions. You can read the original study in a scanned volume on Google Books here.
variable | position | Variable_Label | units | Codes | type |
study_id | 1 | Participant ID | character | ||
treatment | 2 | Treatment | cider, dilute_sulfuric_acid, vinegar, sea_water, citrus, purgative_mixture | factor | |
dosing_regimen_for_scurvy | 3 | Dosing Regimen | 1 quart per day; 25 drops of elixir of vitriol, three times a day; two spoonfuls, three times daily; half pint daily; two lemons and an orange daily; a nutmeg-sized paste of garlic, mustard seed, horseradish, balsam of Peru, and gum myrrh three times a day | factor | |
gum_rot_d6 | 4 | Gum Rot on Day 6 | 0_none, 1_mild, 2_moderate, 3_severe | factor | |
skin_sores_d6 | 5 | Skin Sores on Day 6 | 0_none, 1_mild, 2_moderate, 3_severe | factor | |
weakness_of_the_knees_d6 | 6 | Weakness of the Knees on Day 6 | 0_none, 1_mild, 2_moderate, 3_severe | factor | |
lassitude_d6 | 7 | Lassitude on Day 6 | 0_none, 1_mild, 2_moderate, 3_severe | factor | |
fit_for_duty_d6 | 8 | Fit for Duty on Day 6 | 0_no, 1_yes | factor |