Chi-Square Exceeding Upper bounds Starnet
I have a traverse and I am attempting to do a LSA on it with starnet. However, I am not sure why it is failing the chi-sq test.
I determined a local grid and fixed coordinates for 2 points. Angles and distances were measured with a total station.
Can anyone advise?
Here is my data:
# local Grid
C E 5 48 !!
C D 5 75.977 !!
# Without crosshairs
T A 25-18-42.5 51.099
T E 155-53-30.5 27.977
T D 86-11-7 37.639
T C 66-54-40.5 34.91025
T B 205-42-26.5 40.961
# With crosshairs
M B-A-E 256-32-45.6 22.4735
M C-B-A 13-52-47 73.986
I haven't tried the traverse, but if doesn't have some obvious blunder in it, then anyone who wants to address the Chi-Square issue needs to know what standard errors you have given the program for angles, distances, instrument centering, and target centering.
One apparent problem is that you have fixed both coordinates of points D and E but then give traverse measurements through them. Try freeing one of those four coordinate values.
Passes easily for me with the following standard errors:
Project Default Instrument
Distances (Constant) : 0.005000 FeetInt
Distances (PPM) : 2.000000
Angles : 3.000000 Seconds
Directions : 3.000000 Seconds
Azimuths & Bearings : 3.000000 Seconds
Centering Error Instrument : 0.003000 FeetInt
Centering Error Target : 0.010000 FeetInt
I took an Error Analysis Class.
The instructor said he doesn't even care if it passes Chi Square or not. I got the vapors, they had to give me smelling salts.
If it exceeds the lower bound, I don't worry about it. If it exceeds the upper bound then I look for my stupid mistake I can't see for the life of me even though it is staring right at me.
People who deal with social stats usually don't care about the chi square result. When you actually have to make things work it needs to pass...