How do I add a trendline in numbers for iPad?

I want to add a trendline to a 2D scatter chart in numbers on my iPad Air. Can anyone help me with this?

if you want to add a linear best fit line you can get the parameters for that line from your existing data and make a NEW series:
Using my previous charts you can add a new table (in this case below the chart) used to calculate the slope (m) and the y-intercept (b) for each of the original series. Then you can use those two values with the original X values to construct a best fit line. The bottom table is named "Best Fit Constants" and is constructed:
B1=INDEX(LINEST(Data :: C,Data :: B,TRUE), 2)
B2=INDEX(LINEST(Data :: C,Data :: B,TRUE), 1)
D1=INDEX(LINEST(Data :: E,Data :: D,TRUE), 2)
D2=INDEX(LINEST(Data :: E,Data :: D,TRUE), 1)
The original table (which I named "Data") is constructed as follows:
F2=B2
G2=Best Fit Constants :: $B$1+Best Fit Constants :: $B$2*F2
H2=D2
I2=Best Fit Constants :: $D$1+Best Fit Constants :: $D$2*H2
select F2 thru I2 and fill down as needed. Expand the graph range by selecting the chart,
then dragging the data range controls (in the table) to include the best fit data

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Please : Search for questions similar to your own before submitting them to the community
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