Quadratic regression model with line

Asked Oct 11 '17 at 04:46

Active Oct 11 '17 at 05:24

Viewed 26 times

I am trying to make quadratic regression line of my plot but, in my graph, I found too many line sticked together. I want a single line and not too many. Can anyone help me?

Thanks, my code is as follows data1 <- read.csv("C:/Users/Tej Prasad Acharya/Documents/NUE/NDVI and SPAD.csv") attach(data1)

withrow <- data1[which(data1$Rowcover == "Yes"),]
withoutrow <- data1[which(data1$Rowcover == "No"),]

withrow <- data1[which(data1$Rowcover == "Yes"),]
withoutrow <- data1[which(data1$Rowcover == "No"),]

plot(withrow$SPAD..60.DAT. ~ withrow$N.rate)
m2 <- lm(withrow$SPAD..60.DAT. ~ withrow$N.rate + I(withrow$N.rate^2))
lines(withrow$N.rate,predict(m2))

please see the below picture. I only need one line that goes from the middle of the point of each treatment.

edited Oct 11 '17 at 05:24

Juan

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asked Oct 11 '17 at 04:46

tej prasad acharya

please include your data – iskandarblue Oct 11 '17 at 05:16
Did you have a look [here](https://stackoverflow.com/questions/25283367/plot-a-best-fit-line-r)? – Maurits Evers Oct 11 '17 at 05:35

Quadratic regression model with line

please see the below picture. I only need one line that goes from the middle of the point of each treatment.

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