Adding a straight line to a qqnorm plot

Hey all,

I have the following code:

IDRTlme <- lme(Score ~ Group + Condition + Group*Condition, random = ~ 1|ID, data = IDRTnew)

I then enter the following to display a qq-plot to check for normality:

qqnorm(IDRTlme)

This gives the output:

Screenshot 2022-04-30 at 11.43.16

How do I add a straight line across the diagonal to this plot?

I would be very grateful for any assistance!

Minimum reproducible example:

structure(list(ID = c("1993", "1993", "1993", "1993", "1993", 
"1993", "1997", "1997", "1997", "1997", "1997", "1997", "19998", 
"19998", "19998", "19998", "19998", "19998", "3122", "3122", 
"3122", "3122", "3122", "3122", "3152", "3152", "3152", "3152", 
"3152", "3152", "330", "330", "330", "330", "330", "330", "354", 
"354", "354", "354", "354", "354", "363", "363", "363", "363", 
"363", "363", "369", "369", "369", "369", "369", "369", "370", 
"370", "370", "370", "370", "370", "375", "375", "375", "375", 
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"388", "388", "388", "388", "388", "388", "390", "390", "390", 
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"199950", "199950", "199950", "191", "191", "191", "191", "191", 
"191"), Condition = c("neutral", "neutral_social", "no_money", 
"positive_social", "selfharm", "win_money", "neutral", "neutral_social", 
"no_money", "positive_social", "selfharm", "win_money", "neutral", 
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Hi @eyavuz21 ,

see the documentation qqnorm. I think you can add qqline(), so

qqnorm(IDRTlme)
qqline(IDRTlme)

is probably what you're after?

JW

1 Like

Thanks so much!

I used: qqnorm(IDRTlme, abline = c(0, 1))

It worked :slight_smile:

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