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POadding 3 third order polynomial equations in a ggplot
 

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  1. POadding 3 third order polynomial equations in a ggplot
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    <p>I have plotted the following data with ggplot2 and then add 3rd order polynomial lines for each group consulting the post: <a href="https://stackoverflow.com/questions/11949331/adding-a-3rd-order-polynomial-and-its-equation-to-a-ggplot-in-r?rq=1">Adding a 3rd order polynomial and its equation to a ggplot in r</a> Data:</p> <pre><code>&gt;lai.se1 DOS DAS N LAI sd se ci D1 31 24 1.5879167 0.42763230 0.08729008 0.18057328 D1 84 24 4.3241667 0.32478644 0.06629675 0.13714529 D1 113 24 3.7037500 0.34151596 0.06971165 0.14420954 D1 132 24 2.9704167 0.33386380 0.06814966 0.14097832 D1 160 24 0.1879167 0.09868611 0.02014422 0.04167149 D2 35 24 1.7679167 0.18551876 0.03786886 0.07833770 D2 82 24 3.7670833 0.38212767 0.07800148 0.16135836 D2 108 24 3.4104167 0.31431747 0.06415978 0.13272463 D2 126 24 2.7879167 0.35024189 0.07149283 0.14789418 D2 146 24 0.1950000 0.08836682 0.01803780 0.03731404 D3 37 24 1.3179167 0.16378616 0.03343271 0.06916083 D3 83 24 3.5233333 0.29256982 0.05972057 0.12354140 D3 94 24 3.1604167 0.28257326 0.05768002 0.11932022 D3 113 24 2.4587500 0.44131535 0.09008312 0.18635113 D3 134 24 0.2758333 0.09536733 0.01946677 0.04027009 p&lt;-ggplot(lai.se1, aes(x=DAS, y=LAI, colour=DOS)) + geom_errorbar(aes(ymin=LAI-sd, ymax=LAI+sd), colour ="black", size =.3, width=1, position=position_dodge(.9)) + geom_point(size=1, shape=21, fill=FALSE)+ theme_bw() p + stat_smooth(method="lm", se=TRUE, fill=NA, ## to add polynomial lines formula=y ~ poly(x, 3, raw=TRUE)) </code></pre> <p>Plot: <img src="https://i.stack.imgur.com/HR9IN.png" alt="enter image description here"></p> <pre><code>## Add equation in the plot lm_eqn = function(lai.se1){ m=lm(y ~ poly(x, 3), lai.se1)#3rd degree polynomial eq &lt;- substitute(italic(y) == a + b %.% italic(x)*","~~italic(r)^2~"="~r2, list(a = format(coef(m)[1], digits = 2), b = format(coef(m)[2], digits = 2), r2 = format(summary(m)$r.squared, digits = 3))) as.character(as.expression(eq)) } p + annotate("text", x=0.5, y=15000, label=lm_eqn(lai.se1), hjust=0, size=8, family="Times", face="italic", parse=TRUE) Error: Error in model.frame.default(formula = y ~ poly(x, 3), data = lai.se1, : variable lengths differ (found for 'poly(x, 3)') </code></pre> <p>But as I tried to place the equations using similar function mentioned the above linked post, it gave an error of variable length. I am not really good at writing new functions in r and need your help to solve it. Please help. </p>
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    1. USBarun
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      1. POadding 3 third order polynomial equations in a ggplot
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    1. COWhat command gave the error? What is the error `exactly`? It'd be a good place for people trying to help to start. So far your question is not clear (or rather there is no question except that you would like to get help).
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      1. POadding 3 third order polynomial equations in a ggplot
      1. USArun
    2. CODear Arun, I want to put the respective equations and r^2 values for those lines in the same plot. that's my problem. I am adding the code and the generated error.
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      1. POadding 3 third order polynomial equations in a ggplot
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    3. CO(+1) for the nice and complete edit!
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      1. POadding 3 third order polynomial equations in a ggplot
      1. USArun
 

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