Hi Tim

Thank you for your suggestion.
About the Tt = a + b.Yt equation format. We found it in one of our references. I think it is not a big problem about the differences in equation format, since it has the same meaning. But we will check again the general international format to write a Trend equation. Thank you.

About the bug of Zaitun Time Series in viewing the trend equation which has small values in its slope or intercept. Zaitun Time Series round the slope and intercept values to 3 decimals only in the linear trend equation viewed in Model Summary tab. But in the calculation of forecasted, residual, predicted, values of the model, it uses the original slope and intercept values without any rounding process. So, the forecasted values, residual, and predicted values and the other criteria (such as R, MSE,etc) do not affected on the automatic rounding process, since they use the original slope and intersect values (without rounding process) in their calculation.

We will try to change the linear trend equation in Zaitun Time Series Trend Model Summary into a scientific notation, especially when it handle a variable with small values. Please wait the next revision of Zaitun Time Series (version 0.1.3) which includes the bug fix of the problem above. I will be released soon.
Thank you for your feedback.