Chapter 01, error in plot in cell 17

[hassec]

I think the plot in cell 17 in chapter 01, has a slight error.
The text states an initialization of the filter of weight=160 and that weighing starts on day 1.
Yet the plot shows the measurements starting at day zero.
I think it's simply a mistake that the measurements aren't plotted with an x-axis offset of 1 day, as is done for the predictions.
Then the plot would also make more sense in the way that a measurement results in an estimate between measurement and prediction.

Happy to make a PR, if you wish.

[MichaelHay42]

I agree the 1-day offset threw me off too

[rlabbe]

fixed, thanks!