Re: [R] Equation of a curve

On 03/04/2014 16:26, Frances Cheesman wrote: Hi all, I have a number of bacterial growth curves I would like to find the equations for these and then integrate them to find the area under the curves for me to do stats on later. Is there any way I can do this in R? Thanks, Frances

Re: [R] Equation of a curve

Thanks everyone for al your help, I don't think it's necessarily as easy as I first thought. I'm going to have a think about it and try some things out. And I'll be back if I get stuck! Thanks very much, Frances On 4 April 2014 09:11, Keith Jewell keith.jew...@campdenbri.co.uk wrote: On

[R] Equation of a curve

Hi all, I have a number of bacterial growth curves I would like to find the equations for these and then integrate them to find the area under the curves for me to do stats on later. Is there any way I can do this in R? Thanks, Frances [[alternative HTML version deleted]]

Re: [R] Equation of a curve

Subject: [R] Equation of a curve Hi all, I have a number of bacterial growth curves I would like to find the equations for these and then integrate them to find the area under the curves for me to do stats on later. Is there any way I can do this in R? Thanks, Frances

Re: [R] Equation of a curve

You may have a different use in mind, but I think integration does not make sense for growth curves. And there is no simple, general equation that I'm aware of: When you determine the area under the curve (integration), you are essentially multiplying bacterial mass by time. Imagine that you

Re: [R] Equation of a curve

The mean value theorem of integration (I have a cross-stitch of this theorem hanging on my wall (between cross-stitches of the central limit theorem and Bayes theorem)) tells us that the area under a curve is equal to the width of the area of interest times the average height of the curve. Often