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The Standard Pac routine seems a little bit closer to what gileno is looking for than the Business Pac routine.
I suspect what gileno really was asking about is a program that pick pics the best fit automatically from a list of possibilities (linear, exponential, power, logarithmic) based on the highest r-value. The HP41 Advantage Pac routine CFIT can do this. In the HP67 routine in question, and in the HP41 Stat Pac curve fitting, one must do each fit manually then compare r-values and pick the one you want. That said, there MUST be enough registers even in the HP67/97 to keep track of all of the necessary sums besides those collected in the stats registers.