Aptech Systems, Inc. Worldwide Headquarters
Aptech Systems, Inc.
2350 East Germann Road, Suite #21
Chandler, AZ 85286
Ready to Get Started?
Request Quote & Product Information
Training & Events
Step-by-step, informative lessons for those who want to dive into GAUSS and achieve their goals, fast.
Have a Specific Question?
Q&A: Register and Login
Premier Support and Platinum Premier Support are annually renewable membership programs that provide you with important benefits including technical support, product maintenance, and substantial cost-saving features for your GAUSS System or the GAUSS Engine.
Join our community to see why our users are considered some of the most active and helpful in the industry!
Where to Buy
Recent Tagsapplications character vectors CML CMLMT Constrained Optimization datasets dates dlibrary dllcall error error handling errors Excel file i/o floating network GAUSS Engine graphics GUI hotkeys installation Java API license licensing linux loading data loops matrices matrix matrix manipulation Maxlik MaxLikMT Memory optimization Optmum output PQG graphics procs RAM random numbers string functions strings structures threading Time Series writing data
Time Series 2.0 MT
Find out more now
Time Series MT 2.1
Find out more now
The covariance matrix returned from Maxlik (or CML or CMLMT) is a missing value
The covariance matrix being returned from Maxlik (or CMLMT) is a missing value and I am getting the error message "Hessian calculation failed". Why is this happening?
If the covariance matrix is a scalar missing value and the “Hessian Calculation failed” message is issued, the calculated Hessian has failed to invert. This means it contains linear dependencies. These dependencies can be due to poor scaling of the data, catastrophic failure of precision, or unidentified parameters in your model.