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e59d91d | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 | /**
* Letter grades for ACS Gini index of income inequality (household), raw 0–1 scale.
* Lower Gini ⇒ more equal ⇒ better letter. Buckets are fixed (not percentile-based) so
* the same value always maps to the same letter across map and scorecard.
*/
export type GiniLetter = 'A' | 'B' | 'C' | 'D' | 'F'
export type GiniLetterGrade = {
letter: GiniLetter
blurb: string
letterClass: string
blurbClass: string
chipClass: string
}
/** Horizontal legend strip: letter + optional “ = …” tail (scorecard / map). */
export type GiniLetterStripRow = {
letter: GiniLetter
letterClass: string
/** e.g. " = Very equal" — omit for middle letters to match compact layout */
tail: string
}
export const GINI_LETTER_STRIP: readonly GiniLetterStripRow[] = [
{ letter: 'A', letterClass: 'text-emerald-700', tail: ' = Very equal' },
{ letter: 'B', letterClass: 'text-lime-700', tail: '' },
{ letter: 'C', letterClass: 'text-amber-700', tail: '' },
{ letter: 'D', letterClass: 'text-orange-700', tail: '' },
{ letter: 'F', letterClass: 'text-rose-700', tail: ' = High gap' },
] as const
const BUCKETS: { letter: GiniLetter; max: number; blurb: string; letterClass: string; blurbClass: string; chipClass: string }[] =
[
{
letter: 'A',
max: 0.43,
blurb: 'Very equal',
letterClass: 'text-emerald-700',
blurbClass: 'text-emerald-800',
chipClass: 'border-emerald-200 bg-emerald-50 text-emerald-900',
},
{
letter: 'B',
max: 0.455,
blurb: 'More equal than typical',
letterClass: 'text-lime-700',
blurbClass: 'text-lime-900',
chipClass: 'border-lime-200 bg-lime-50 text-lime-950',
},
{
letter: 'C',
max: 0.48,
blurb: 'Typical inequality',
letterClass: 'text-amber-700',
blurbClass: 'text-amber-900',
chipClass: 'border-amber-200 bg-amber-50 text-amber-950',
},
{
letter: 'D',
max: 0.505,
blurb: 'Less equal than typical',
letterClass: 'text-orange-700',
blurbClass: 'text-orange-900',
chipClass: 'border-orange-200 bg-orange-50 text-orange-950',
},
{
letter: 'F',
max: Infinity,
blurb: 'High gap',
letterClass: 'text-rose-700',
blurbClass: 'text-rose-900',
chipClass: 'border-rose-200 bg-rose-50 text-rose-950',
},
]
/** Map / compact table: letter + numeric bucket hint + chip colors. */
export const GINI_CHOROPLETH_LEGEND_CHIPS: readonly { letter: GiniLetter; hint: string; chipClass: string }[] =
BUCKETS.map((b) => ({
letter: b.letter,
hint: b.letter === 'F' ? '> 0.505' : `≤ ${b.max}`,
chipClass: b.chipClass,
}))
export function giniLetterGradeFromValue(gini: number | null | undefined): GiniLetterGrade | null {
if (gini == null || !Number.isFinite(gini)) return null
const g = gini
for (const b of BUCKETS) {
if (g <= b.max) {
return {
letter: b.letter,
blurb: b.blurb,
letterClass: b.letterClass,
blurbClass: b.blurbClass,
chipClass: b.chipClass,
}
}
}
const last = BUCKETS[BUCKETS.length - 1]!
return {
letter: last.letter,
blurb: last.blurb,
letterClass: last.letterClass,
blurbClass: last.blurbClass,
chipClass: last.chipClass,
}
}
/** Short suffix for tooltips / compact values, e.g. `` · A``. */
export function giniLetterSuffix(gini: number | null | undefined): string {
const m = giniLetterGradeFromValue(gini)
return m ? ` · ${m.letter}` : ''
}
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