changing y-axis intervals in a boxplot

Thank you Pascal but unfortunelately i still didn't figure out how to change the numbers presented at the y-axis.

I looked up your suggestions but if I'm right, yaxt can set if the axis is presented (yaxt="s") or suppressed (yaxt="n") which does not help for changing the values on the y-axis.

The 'at' argument did solve my problem but in a clumsy way. Although I'm happy that I managed, does anyone know how to do the same job in a more convenient way?

This is the 'clumsy' code I used:

boxplot((fitted(finalfit4) *100) ~ instabilitydata2$MRI_Diag_Instab_rev, ylim=c(0,100), xlab="MRA diagnosis", ylab="Predicted probability (%)")
axis(side=2, at="10")
axis(side=2, at="30")
axis(side=2, at="50")
axis(side=2, at="70")
axis(side=2, at="90")

Kind regards, 

Tobias

-----Oorspronkelijk bericht-----
Van: Pascal Oettli [mailto:kridox at ymail.com] 
Verzonden: vrijdag 29 maart 2013 8:44
Aan: Berg, Tobias van den
CC: 'r-help at r-project.org'
Onderwerp: Re: [R] changing y-axis intervals in a boxplot

Hello,

?par (particularly the 'yaxt' argument)
?axis ('side' and 'at' arguments)

Hope this help,
Pascal

Dear R-users,

I'm a bit of a rooky in R and do not know how to change the y-axis intervals of a boxplot.

The y-axis in my boxplot ranges from 0 to 100 which is fine. The problem is the interval level in between. Now it increases with steps of 20 but I'd like to have it changed by steps of 5.

Anyone knows how to do this in R?

I used the following code for producing this boxplot:
boxplot((fitted(finalfit4) *100) ~ instabilitydata2$MRI_Diag_Instab_rev, ylim=c(0,100), xlab="MRA diagnosis", ylab="Predicted probability (%)")


Kind regards, Tobias



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