i am trying to determine what kind of mathematical modeling could be applied following two variables,let us call them $x$ and $y$ ,namely change one variable has effect second on,i have several variants to clarify more situation,let us introduce first $x$ variable
X =
12
43
36
98
and corresponding $y$
3658.16054016237
3615.00868922681
1599.25625005297
1599.02933228482
1339.16619762869
1339.14816547966
443.146645689262
443.056409980496
let this be first pair,but please note that $y$ is complex pair,which means that in $y$ one pair corresponds complex number,that why we have $4$ variable in $x$ and $8$ in $y$,second pair we have
X1
44
43
36
98
and
$Y1$
3658.19707577357
3615.01045850880
1634.39730289734
1630.86825150938
1597.96549473147
1594.19883425116
1339.00595993825
1338.65395128803
for more clarification i have consideration one more test third $x$ variable
9 11 21 78
and corresponding output
2912.15233723249
2877.56286664859
783.071088238042
783.036270917237
412.991992321979
413.185665961216
332.019809596029
331.961759607682
there of course large pair corresponds largest in $x$,second largest second biggest element in $x$ and so on,i think that it should polynomial order or exponential,but i think that polynomial order fitting would not be more help full,so something exponential should be in damped form,or damped exponential form should corresponds to each other,so please help me