Is qplot different from plot?

[石浜裕太郎]

I would like to plot the fitting result using RStan.

This successfully generated the result, which is saved in fit.

When I use 

plot(fit, pars=par)

it worked.

But, when I use

qqplot(fit)+geom_line()

it did not work.

I did not forget library(ggplot2).

I am wondering if 

rstan::extract(fit)

is needed.

Thanks in advance for your kind help

[Roman Luštrik]

Perhaps you could describe what yo're trying to plot. Mean with confidence interval for every parameter? Can you give a reproducible example?

Cheers,

Roman

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[Theo Mouton]

Ggplot has a personal grammar which you will have to learn if you want to use ggplots.

First a ggplot starts by:

ggplot(data=, aes(x=,y=)).

Please see the Rstudio ggplot2 cheatsheet or the many stackoverflow questions

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[Hiroaki Yutani]

plot() is a generic function and knows how to plot because the specific method for stanfit class is implemented in rstan package and the method generates ggplot object ("gg" class) so you can add other layers like geom_line() by + operator.

qplot() is not such kind of a function; it is just a shortcut for ggplot(). If you need more control over the plot than what plot() automatically does, I guess you will need to execute rstan::extract() and manually compose a ggplot by yourself.

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[石浜裕太郎]

thanks very much. I am studying this issue by starting from what rstan::extract() generates.

2017年8月6日日曜日 23時48分43秒 UTC+9 Hiroaki Yutani:

plot() is a generic function and knows how to plot because the specific method for stanfit class is implemented in rstan package and the method generates ggplot object ("gg" class) so you can add other layers like geom_line() by + operator.

qplot() is not such kind of a function; it is just a shortcut for ggplot(). If you need more control over the plot than what plot() automatically does, I guess you will need to execute rstan::extract() and manually compose a ggplot by yourself.

2017-08-06 16:49 GMT+09:00 石浜裕太郎 <ishiham...@hotmail.com>:

I would like to plot the fitting result using RStan.

This successfully generated the result, which is saved in fit.

When I use 

plot(fit, pars=par)

it worked.

But, when I use

qqplot(fit)+geom_line()

it did not work.

I did not forget library(ggplot2).

I am wondering if 

rstan::extract(fit)

is needed.

Thanks in advance for your kind help

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[石浜裕太郎]

thanks very much. I will refer to this cheatsheet.

2017年8月6日日曜日 20時36分14秒 UTC+9 Theo Mouton:

[石浜裕太郎]

thanks very much for the reply.I would like to plot mean with confidence.

2017年8月6日日曜日 18時38分16秒 UTC+9 Roman Luštrik:

Perhaps you could describe what yo're trying to plot. Mean with confidence interval for every parameter? Can you give a reproducible example?

Cheers,

Roman

On Sun, Aug 6, 2017 at 9:49 AM, 石浜裕太郎 <ishiham...@hotmail.com> wrote:

I would like to plot the fitting result using RStan.

This successfully generated the result, which is saved in fit.

When I use 

plot(fit, pars=par)

it worked.

But, when I use

qqplot(fit)+geom_line()

it did not work.

I did not forget library(ggplot2).

I am wondering if 

rstan::extract(fit)

is needed.

Thanks in advance for your kind help

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