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So, I'm running an old version of R (2.14.0) on Mac OS X 10.10.1 and I can't load the "effects" package. It took me long enough to track down all the dependencies I needed to install effects, but I still can't get it to load. I have colorspace, lattice, grid, MASS, & nnet. But when I input library(effects) I get the following output:

Loading required package: lattice
Loading required package: grid
Loading required package: MASS
Loading required package: nnet
Loading required package: colorspace

Attaching package: ‘effects’

The following object(s) are masked from ‘package:datasets’:

    Titanic

When I search ?Titanic I get:

Help on topic ‘Titanic’ was found in the following packages:

Package               Library
effects               /Users/zoe/Dropbox/Zoe_Folder/IPE/R-2.14.0/library
datasets              /Users/zoe/Dropbox/Zoe_Folder/IPE/R-2.14.0/library

Choose one 

1: Survival of Passengers on the Titanic {effects}
2: Survival of passengers on the Titanic {datasets}

What do I do? (I can't use R 3 because I need a really specific statistical package for statistical ecology that only runs on R 2.) I would really appreciate any insight!

little_chemist
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    I don't see the problem here? Is `effects` not loaded properly here? – ila Jul 15 '15 at 15:58
  • That's just a notice about variable masking; that's not an error. Nothing you've shown here indicates the package did not load or work. Are you getting some other error? – MrFlick Jul 15 '15 at 16:01
  • Oh, haaa. Maybe there is no problem. I'm just very new to R. And I don't understand what it means for an object to be masked from a package. Is it just a way of confining the two `Titanic` objects to their respective packages--so that they don't get mixed up? I'm just trying to make a simple box plot, but no graph is appearing. I thought it had to do with `effects`, but I guess it's something else then. Thank you! – little_chemist Jul 15 '15 at 16:13
  • No, I'm not getting any other error messages. Something else must be wrong :( Thank you all for your help! – little_chemist Jul 15 '15 at 17:00

1 Answers1

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Nothing's wrong - it's loaded fine!

It's just saying you have two datasets with the same name defined in different packages. I imagine that they are the same, but if you wanted to use one or the other you could use:

effects::Titanic
datasets::Titanic

This will happen with functions as well as datasets. Same method to pick which function from which package.

Mhairi McNeill
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