Thanks for the help. I have a reason to continue with R-3.0.3. I used maxLik to estimate econometric models and some of them are better handled with R-3.0.3 (but not later)----a sad reality I do not like.

Here is what I did. I downloaded

https://cran-archive.r-project.org/bin/windows/contrib/3.0/aod_1.3.zip

and installed the zip file, which worked in both RStudio and R (without RStudio).

In RStudio, I go Tools -> Install packages -> Install from -> (Choose zip) -> (Browse to the zip file)

IN R, I go Packages -> Install packages from local file(s) -> (Browse to the zip file)...

Below is the command line generated and the prompt.

> install.packages("C:/Users/USER/Downloads/aod_1.3.zip", repos = NULL, type = "win.binary")
package ‘aod’ successfully unpacked and MD5 sums checked

I will always be able to download the proper .zip file from CRAC Archive, right. So, this will always work for me? Thank you all !! If there are more direct options that work, I would still be interested to know.

Steven Yen

On 2020/10/9 上午 12:49, Duncan Murdoch wrote:
Don't choose a mirror.  That will override the repos choice.

Do update R to a current version if you aren't able to debug this yourself.

Duncan Murdoch

On 08/10/2020 12:38 p.m., Steven Yen wrote:
Sorry Gentlemen and all. Now this is becoming a joke (to me). I repeated
what I did earlier, with and without the option to set repos suggested
by Duncan. Now it does not work. I wonder whether it is dependent on the
mirror I chose, but I do not remember the one I chose earlier when it work.

I need your help, gentlemen, as I need to use R-3.0.3 for my task.

  > options(repos="https://cran-archive.r-project.org";)
  > chooseCRANmirror()
  > install.packages("aod")
Warning: unable to access index for repository
https://cran-archive.r-project.org/bin/windows/contrib/3.0
Warning: unable to access index for repository
http://lib.stat.cmu.edu/R/CRAN/bin/windows/contrib/3.0

     package ‘aod’ is available as a source package but not as a binary

Warning message:
package ‘aod’ is not available (for R version 3.0.3)
  > install.packages("aod",repos='https://cran-archive.r-project.org')
Warning: unable to access index for repository
https://cran-archive.r-project.org/bin/windows/contrib/3.0
Warning message:
package ‘aod’ is not available (for R version 3.0.3)

On 2020/10/9 上午 12:02, Duncan Murdoch wrote:
Okay, so it's not an RStudio issue. However, I'd guess setting

   options(repos = "https://cran-archive.r-project.org";)

at the start of your session could make everything work.  (I'm
guessing you currently have it set to "http://cran.rstudio.com";, which
is the source of the last warning below, probably due to an R bug.
But since you're using an obsolete version of R, it shouldn't surprise
you that it has bugs that nobody else is seeing.)

Duncan Murdoch

On 08/10/2020 11:54 a.m., Steven Yen wrote:
Thanks. You gentlemen please tell me what this means. In R (outside
of RStudio) I ran:

install.packages("aod")

Received a warning (and installation did not seem to go through).

Then I tried

install.packages("aod",repos='https://cran-archive.r-project.org')

Received a warning but it went on to try

https://cran-archive.r-project.org/bin/windows/contrib/3.0/aod_1.3.zip

and it worked. See log below.

I expect to continue to use R-3.0.3 for a while and I very much like
this to become a routine. Thank you all.

Steven Yen

  > install.packages("aod")
Warning in install.packages :
    unable to access index for repository
http://cran.rstudio.com/bin/windows/contrib/3.0
Warning in install.packages :
    unable to access index for repository
http://cran.rstudio.com/bin/windows/contrib/3.0

     package ‘aod’ is available as a source package but not as a binary

Warning in install.packages :
    package ‘aod’ is not available (for R version 3.0.3)
  > install.packages("aod",repos='https://cran-archive.r-project.org')
Warning in install.packages :
    unable to access index for repository
http://cran.rstudio.com/bin/windows/contrib/3.0
trying URL
'https://cran-archive.r-project.org/bin/windows/contrib/3.0/aod_1.3.zip'
Content type 'application/zip' length 225712 bytes (220 Kb)
opened URL
downloaded 220 Kb

package ‘aod’ successfully unpacked and MD5 sums checked

The downloaded binary packages are in
C:\Users\USER\AppData\Local\Temp\RtmpY7t6Ll\downloaded_packages

On 2020/10/8 下午 10:52, Duncan Murdoch wrote:
Just remembered:  RStudio runs its own wrapper around
install.packages().  Steven, you should try doing the install from
outside of RStudio, and see if it makes a difference.

Duncan Murdoch

On 08/10/2020 9:59 a.m., Duncan Murdoch wrote:
He didn't specify the RStudio repos, though it's probably implicitly
specified in getOption("repos").  I wonder why install.packages() is
looking there, when repos is given explicitly?

On 08/10/2020 8:54 a.m., Uwe Ligges wrote:
Drop the RStudio repos.

Best,
Uwe Ligges

On 05.10.2020 11:10, Steven Yen wrote:
Thanks. I did as suggested but still received a warning, though the
installation went through. Anything I could do to install without
the
warning message.

What is the contrib.url argument?

    >
install.packages("aod",repos='https://cran-archive.r-project.org')
Warning in install.packages :
      unable to access index for repository
http://cran.rstudio.com/bin/windows/contrib/3.0
trying URL
'https://cran-archive.r-project.org/bin/windows/contrib/3.0/aod_1.3.zip'

Content type 'application/zip' length 225712 bytes (220 Kb)
opened URL
downloaded 220 Kb

package ‘aod’ successfully unpacked and MD5 sums checked

The downloaded binary packages are in
C:\Users\USER\AppData\Local\Temp\Rtmp46p9a3\downloaded_packages
    >

On 2020/10/5 下午 04:58, Uwe Ligges wrote:
Then you'd rather need

install.packages("aod",repos='https://cran-archive.r-project.org')

or use the contrib.url argument.

Best,
Uwe Ligges


On 05.10.2020 10:47, Steven Yen wrote:
Thanks for the help. I do update to the latest R-4.0.2. As I said,
for reasons that's hard to explain, some of my tasks are better
handled with an older version of R, in this case R-3.0.3.
Please just
help me install packages successfully with this older version
of R.

I ran the following line but obviously was not getting it across.

=====

install.packages("aod",repos='https://cran-archive.r-project.org/bin/windows/contrib/3.0/')

Warning in
install.packages : unable to access index for repository
http://cran.rstudio.com/bin/windows/contrib/3.0 Warning in
install.packages : unable to access index for repository
https://cran-archive.r-project.org/bin/windows/contrib/3.0/bin/windows/contrib/3.0

Warning in install.packages : package ‘aod’ is not available
(for R
version 3.0.3)

On 2020/10/5 下午 04:12, Uwe Ligges wrote:
From

../ReadMe
in the mentioned web resource:

"Packages for R >= 1.7.0 and R < 3.2.0 are available from
https://cran-archive.r-project.org/bin/windows/contrib/";

We do not hold binaries of several year old versions of R on
CRAN.

Note that R 3.0.0 is 7 years old. You shoudl realy consider to
update to 4.0.2.

Best,
Uwe Ligges




On 05.10.2020 09:56, Steven Yen wrote:
I had to install/use an older version of (R-3.0.3) for a
reason. While
installing a package from CRAN (either in RStudio or R), I
received
the
following warning message saying unable to access index for
repository
http://cran.rstudio.com/bin/windows/contrib/3.0. See message
below. In
this case, I tried to install "aod". The install nevertheless
went
through, as confirmed by the library statement (I did not try
to use
it). Any idea? Thank you.

=====

Warning: unable to access index for repository
http://cran.rstudio.com/bin/windows/contrib/3.0 Warning:
unable to
access index for repository
http://cran.rstudio.com/bin/windows/contrib/3.0 >
install.packages("aod") Warning in install.packages : unable
to access
index for repository
http://cran.rstudio.com/bin/windows/contrib/3.0
Warning in install.packages : unable to access index for
repository
http://cran.rstudio.com/bin/windows/contrib/3.0 package ‘aod’ is
available as a source package but not as a binary Warning in
install.packages : package ‘aod’ is not available (for R version
3.0.3)
     > library(aod)


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