From: Improved RIDIT statistic approach provides more intuitive and informative interpretation of EQ-5D data
Level of severity (l)
1
…
2
k
Total
Sample Y
\( {f}_Y^{(1)} \)
\( {f}_Y^{\left(k-1\right)} \)
\( {f}_Y^{(k)} \)
ny
Sample X
\( {f}_X^{(1)} \)
\( {f}_X^{\left(k-1\right)} \)
\( {f}_X^{(k)} \)
nx
t1
tk − 1
tk
N = ny + nx