polynomial scatter band within excel min max plot

[dacf]

I am trying to plot minimum and maximum lines on a polynomial scatter band within excel. I am able to plot the mean line ok but there doesn’t appear to be an option to actually plot a given 1.65 standard deviation above and below the line. There is an error bar and standard deviation function but it doesn’t actually plot these lines.

The Y-axis on my graph needs to be a logarithmic scale.

Does anyone know if this can be done in excel?

Regards

 

[m777182]

I do not know exactly what do you wish:if you would like to plot only min and max line over the entire x-range then simply add two columns at your x-y data range and the first has for all values of x the value of Ymin; the second has for all x- values the value of Ymax, but I think this is not the point. I suppose you would like to plot the upper and the lower confidence limits lines; regretfully excel does not provide them but you can easily construct them with some VBa programming. You should calculate standard errors of the estimates of the coefficients of your polynomial regresson line and construc with those coefficients two more ranges of Y, Y-upper and Y-lower namely.
Is that what you would like to do?
m777182