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rogueviz:: statistics:: kendall was not pushed

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Zeno Rogue
2024-07-28 08:31:36 +02:00
parent 4272e6f9e4
commit 617f125632
1 changed files with 52 additions and 0 deletions
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52
rogueviz/statistics.cpp
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@@ -136,6 +136,58 @@ template<int dim1, int dim2> double small_kendall(const vector<pair<int, int>>&
return tau / par;
}
template<class T> double kendall(vector<pair<int, T>> allp) {
int maxx = 0;
for(const auto& a: allp) maxx = max(maxx, a.first);
maxx++;
vector<int> counts(maxx, 0);
vector<int> totals(maxx, 0);
double tau = 0;
sort(allp.begin(), allp.end(), [] (auto a, auto b) { return a.second < b.second; });
auto last = allp[0].second;
vector<int> to_add;
for(const auto& a: allp) {
if(a.second != last) {
for(auto ad: to_add) {
totals[ad]++;
for(int x=ad+1; x<maxx; x++) totals[x] += 2;
}
to_add.clear();
last = a.second;
}
to_add.push_back(a.first);
tau += hr::isize(to_add);
tau += totals[a.first];
}
int K = hr::isize(allp);
tau -= K;
double par = K * (K-1.);
println(hr::hlog, tau, " / ", par);
return tau / par;
}
#if TEST
void test_kendall() {
if(1) {
vector<pair<int, int>> p = { {1,1}, {2,2}, {3,3}, {4,4} };
println(hlog, "p = ", stats::kendall(p));
vector<pair<int, int>> q = { {1,1}, {2,2}, {3,3}, {4,3} };
println(hlog, "q = ", stats::kendall(q));
vector<pair<int, int>> r = { {1,1}, {2,2}, {3,4}, {4,3} };
println(hlog, "r = ", stats::kendall(r));
vector<pair<int, int>> s = { {1,1}, {2,2}, {3,3}, {3,4} };
println(hlog, "s = ", stats::kendall(s));
}
}
#endif
}
#endif