Thanks, Rick_SAS! I'm just waking up and getting ready to peruse that link closely. As people speak of such as proton radii being of about e-35 scale, I do continue to wonder how to get even to the e^-31 or e^-32 level in data analysis. Given that a recent SAS GLM run reported Root MSE=0.014742 (which scales to 1.4742% in terms of the modeling of residuals to the first Predicted Model), the question remains as to how to get beyond the e^-16 double-precision standard, via such approaches as long double; though your assurance (that all SAS procedures do, indeed, run with double precision) certainly takes the pressure off of immediate concerns, I'll be looking in passing for a way to run GLM in long-double (or whatever the correct SAS term for that may be), as I continue studying these interesting issues. I'll also be looking for a way to get reports in scientific notation, as having only zeros reported in some fields is ... well ... frustrating. 🙂 I don't know whether dumping a complete SAS GLM output (with estimated coefficients redacted, due to possibly proprietary interests) would be: helpful, appreciated, possible, or seen to be abusive. I'm absolutely open to guidance on such matters. Thanks much for your interest and follow-through. This progress is very encouraging! 🙂 Sincerely, -nanosteve-
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