While troubleshooting an issue with a health bar + damage indicator mod I did some data gathering. After drinking a potion of invisibility I whacked a 220HP skeleton with a wooden dagger until it died. The negative numbers in the following list are damage reports. I believe the -5 numbers are successful sneak attacks which properly did 4.5 damage (the damage indicator erroneously rounded up). The -3 numbers seem to be sneak attack failures that actually dealt 3 damage.
220
(-5) 216
(-5) 211
(-5) 207
(-3) 204
(-5) 199
(-3) 196
(-3) 193
(-5) 189
(-3) 186
(-5) 181
(-5) 177
(-3) 174
(-5) 169
(-3) 166
(-3) 163
(-5) 159
(-5) 154
(-3) 151
(-3) 148
(-5) 144
(-3) 141
(-3) 138
(-3) 135
(-3) 132
(-5) 127
(-5) 123
(-3) 120
(-3) 117
(-5) 112
(-3) 109
(-5) 105
(-3) 102
(-5) 97
(-5) 93
(-3) 90
(-5) 85
(-5) 81
(-3) 78
(-3) 75
(-3) 72
(-3) 69
(-5) 64
(-5) 60
(-3) 57
(-5) 52
(-3) 49
(-3) 46
(-5) 42
(-5) 37
(-5) 33
(-3) 30
(-5) 25
(-5) 21
(-5) 16
(-3) 13
(-5) 9
(-5) 4
(-4) Dead
If you sum the damage reports you get 235, which exceeds the skeleton's HP by 15. There were exactly 30 reports of (-5), so the accumulated rounding error accounts for this excess. That's why I believe the (-3) damage attacks were failures to sneak attack. There were 27 of those. The killing blow appears to be a sneak attack, so it's roughly a 53% success rate in this trial. I did not sneak at all; I only used an invis potion.
I'm not sure if this is intended or not, but I thought I should let you know since I had all the data anyway =P
While troubleshooting an issue with a health bar + damage indicator mod I did some data gathering. After drinking a potion of invisibility I whacked a 220HP skeleton with a wooden dagger until it died. The negative numbers in the following list are damage reports. I believe the -5 numbers are successful sneak attacks which properly did 4.5 damage (the damage indicator erroneously rounded up). The -3 numbers seem to be sneak attack failures that actually dealt 3 damage.
I'm not sure if this is intended or not, but I thought I should let you know since I had all the data anyway =P