In ggplot2 (R Studio), is there a way to extend the regression lines to the end of the plot rather than the last data point

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I am a relative novice to R & ggplot. I am trying to plot an interaction. When I plot the interaction using SPSS - the regression lines go from the y-axis all the way to the opposite edge of the plot:

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However, when I use ggplot, the regression lines only go as far as the first and last data point which makes the graph look strange

enter image description here

Is there any way to remedy this and make my ggplot look more like the SPSS plot?

Here is the code I am using

No5Plot <- ggplot(data=pccdata, aes(x= factor2, y = pcc, color = Factor.1)) +
  geom_point(size=1.2) +
  theme_classic() +
  geom_smooth(method = "lm", se = F) +
  labs(x = "Factor 2", y = "Posterior Cingulate Cortex \n Gyrification")
No5Plot + scale_color_manual(values = c("#CC79A7", "#009E73", "#0072B2")) + 
    theme(axis.title = element_text(size = 20), axis.text = element_text(size=15))
regression ggplot2 plot r
1 Answers

geom_smooth has a fullrange option, which has a default value of FALSE:

Should the fit span the full range of the plot, or just the data?

Thus, you can use:

geom_smooth(method = "lm", se = FALSE, fullrange = TRUE)
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