在我的R线图中添加标准误差线

Question

I have a bar graph that I would like to add standard deviation.

My graph equation is:

curve((exp(1.54 + -0.59*x) )/ (1+ exp (1.54- 0.59*x)), 0,30, ylab = "occupancy", xlab = "Livestock (%)", ylim=c(0,1))

I would like to add two extra lines representing Standard deviation to the graph ( SD= (exp(0.98-0.55*x) )/ (1+ exp (0.98- 0.55*x) )

I have tried using the function errbar but have been unsuccessful.

Can anyone help please?

Answer 1

You can create the plot with curve :

curve((exp(1.54 - 0.59 * x) )/ (1 + exp (1.54 - 0.59 * x)), 0, 30, 
      ylab = "occupancy", xlab = "Livestock (%)", ylim = c(0, 1))

Then, you can use curve with the argument add = TRUE to add a line to the existing plot:

curve((exp(0.98 - 0.55 * x)) / (1 + exp(0.98 - 0.55 * x)), 
      add = TRUE, col = "red", lty = 2)