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ba=0,bs=1e9;for(let n=0;n<=20;n++){const a=n/20,mm=met(yt,pt.map(q=>q.map((x,j)=>(1-a)*x+a*freq[j])));if(mm.brierq.map((x,j)=>(1-ba)*x+ba*freq[j]))),use=cal.brier(1-ba)*x+ba*freq[j]),sp=use?cp:rp;out.push({symbol:s,historyStart:new Date(A[s][0].t).toISOString().slice(0,10),historyEnd:new Date(A[s].at(-1).t).toISOString().slice(0,10),oosN:y.length,validationN:yv.length,calibrationAlpha:ba,calibrationSelected:use,rawValidation:raw,calibratedValidation:cal,currentRaw:Object.fromEntries(CLS.map((c,j)=>[c,rp[j]])),currentSelected:Object.fromEntries(CLS.map((c,j)=>[c,sp[j]])),featureDate:new Date(latest.t).toISOString().slice(0,10),horizonEnd:new Date(latest.t+H*86400000).toISOString().slice(0,10)});}return{source:\"Yahoo Finance chart API\",method:\"purged expanding-window KNN; 5-trading-session horizon; +/-2.0% flat; SPY benchmark features; chronological 60/40 calibration split; calibration only if Brier and logloss both improve\",results:out}}","const ITEMS=[\n {s:\"^GSPC\",n:\"S&P 500\"},{s:\"^IXIC\",n:\"Nasdaq Composite\"},{s:\"^DJI\",n:\"Dow Jones Industrial Average\"},{s:\"^RUT\",n:\"Russell 2000\"},{s:\"^NYA\",n:\"NYSE Composite\"},{s:\"^DJT\",n:\"Dow Transportation Average\"}\n],CLS=[\"Down\",\"Flat\",\"Up\"];\nconst H=5,B=.02,I=500,S=60,K=50;\ntype R={t:number,c:number,q:number};\nconst avg=(a:number[])=>a.reduce((x,y)=>x+y,0)/a.length;\nconst sd=(a:number[])=>{const m=avg(a);return Math.sqrt(avg(a.map(x=>(x-m)**2)))||1};\nasync function get(s:string){const u=new URL(`https://query1.finance.yahoo.com/v8/finance/chart/${encodeURIComponent(s)}`);u.searchParams.set(\"period1\",String(Math.floor(Date.UTC(2018,0,1)/1000)));u.searchParams.set(\"period2\",String(Math.floor(Date.now()/1000)+86400));u.searchParams.set(\"interval\",\"1d\");const r=await fetch(u,{headers:{\"User-Agent\":\"Mozilla/5.0\"}});if(!r.ok)throw Error(`${s}:${r.status}`);const j=await r.json(),z=j?.chart?.result?.[0];if(!z)throw Error(`${s}:no-data`);const 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a=n/20,mm=met(yt,pt.map(q=>q.map((x,j)=>(1-a)*x+a*freq[j])));if(mm.brierq.map((x,j)=>(1-ba)*x+ba*freq[j]))),use=cal.brier(1-ba)*x+ba*freq[j]),sp=use?cp:rp;return{oosN:y.length,validationN:yv.length,calibrationSelected:use,accuracy:(use?cal:raw).accuracy,brier:(use?cal:raw).brier,logloss:(use?cal:raw).logloss,up:sp[2],flat:sp[1],down:sp[0],featureDate:new Date(latest.t).toISOString().slice(0,10)}}\nfunction sumSeries(series:R[][]){const maps=series.map(a=>new Map(a.map(r=>[r.t,r]))),base=series[0].filter(r=>maps.every(m=>m.has(r.t)));return base.map(r=>({t:r.t,c:maps.reduce((x,m)=>x+m.get(r.t)!.c,0),q:1}))}\nexport async function main(){const A:any={};for(const x of ITEMS)A[x.s]=await get(x.s);const bench=A[\"^GSPC\"],results=ITEMS.map(x=>{const s:R[]=A[x.s],last=s.at(-1)!;return{symbol:x.s,name:x.n,lastClose:last.c,lastDate:new Date(last.t).toISOString().slice(0,10),...test(s,bench)}}),sum=sumSeries(ITEMS.map(x=>A[x.s])),last=sum.at(-1)!;return{method:\"purged expanding-window KNN; 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Diff · v2