Hi Listers,

My data code GP attendance per month (I have 24 months worth of data). Plotting the data shows an exponential pattern. I would like to estimate the growth parameter from the data so I can estimate cumulative rates at various months using the CDF formula.

I read in previous threads, one way to estimate the growth parameter is to log transform the Y (number of visits) before running a standard regression.

g ln_visit = ln(visit)

regress ln_visit month

Is the regression coefficient for time the actual growth factor? To estimate the CFD at 6 months, I would need to specify: 1-exp(-btime*6), is this correct?

Would the approach be identical if the curve showed a decay pattern rather than growth?

Thanks in advance!