Critical Strike(CS) is a very important attribute of insight. It has chance to double ur damage,but we can't see its effect on the weapon. So how to compare two insights with different ed&cs? Which will make more damage? That's why we need to know the Equal Damage(Eq Dam) of each insight.
The formula is Eq Dam=[Base Dam*(1+ed%)+Max or Min]*(1+crit%),u can find the crit% of CS level in the table.
Code
Level 1 2 3 4 5 6 7 8 9 10
Crti% 16 25 32 38 42 46 49 51 54 56
Another important point is items with +all skills will benefit the CS level. For example, 6cs insight and andy's face will make ur merc get level 8 CS(51%),with ur cta's battle command,it will go up to level 9 CS(54%). The common gear of merc is insight+andy+forti,and cta of ur hero,so all the Eq Dam was calculated base on +3 all skills,that means 1-6 CS on insight will get 4-9 CS level(38-54%).
From now on,we could choose the better insight. For example,two eth thresher insight 17/230/6(A) and 17/260/1(B),eth thresher base damage is 18-211
Min(A)=18*(1+230%)+9=68,Max(A)=211*(1+230%)=696
Eq Dam(A)=[(68+696)/2]*(1+54%)=588
Min(B)=18*(1+260%)+9=73,Max(B)=211*(1+260%)=759
Eq Dam(B)=[(73+759)/2]*(1+38%)=574
So with the gear of +3 all skills,17/230/6 is better than 17/260/1.
Here is another two eth ca insight,17/230/6(C) and 17/250/4(D),eth ca base damage is 49-225
Min(C)=49*(1+230%)+9=170,Max(C)=225*(1+230%)=742
Eq Dam(C)=[(170+742)/2]*(1+54%)=702
Min(D)=49*(1+250%)+9=180,Max(D)=225*(1+250%)=787
Eq Dam(D)=[(180+787)/2]*(1+49%)=720
So with the gear of +3 all skills,17/250/4 is better than 17/230/6.
Equal Damage of different base (+3 all skills)Code
ed% cs crti% cv ca gt thresher
210 1 38 587 591 500 495
220 2 42 624 628 531 526
230 3 46 661 666 563 558
240 4 49 695 700 592 586
250 5 51 725 730 617 612
260 6 54 761 766 647 641