Using RGoogleAnalytics to retrieve data from google - r

Question

I'm using RGoogleAnalytics to retrieve mutiple dimensions data ,but every time I try to run ga.data <- ga$GetReportData(query)
then I got an error message :Error in fromJSON(api.response.json, method = "C") :
unexpected escaped character '\'' at pos 53
It's ok when I try other functions
How could I fix this？
I use the following code：
require("RGoogleAnalytics")
query <- QueryBuilder()
access_token <- query$authorize()
ga <- RGoogleAnalytics()
ga.profiles <- ga$GetProfileData(access_token)
profile <- ga.profiles$id[3]
startdate <- "2013-10-01"
enddate <- "2013-12-31"
dimension <- "ga:date,ga:source,ga:medium,ga:keyword,ga:city,ga:operatingSystem,ga:landingPagePath"
metric <- "ga:visits,ga:goal1Completions,ga:goal3Completions"
sort <- "ga:visits"
maxresults <- 500000
query$Init(start.date = startdate,
end.date = enddate,
dimensions = dimension,
metrics = metric,
max.results = maxresults,
table.id = paste("ga:",profile,sep="",collapse=","),
access_token=access_token)
ga.data <- ga$GetReportData(query)

Answer 1

I had some trouble with this too,figured out a way.
Step 1: Install Packages
# lubridate
install.packages("lubridate")
# httr
install.packages("httr")
#RGoogleAnalytics
Use this link to download this particular version of RGoogleAnalytics
http://cran.r-project.org/web/packages/RGoogleAnalytics/index.html
Step 2: Create Client ID and Secret ID
Navigate to Google Developers Console.
(https://console.developers.google.com/project)
Create a New Project and Open it.
Navigate to APIs and ensure that the Analytics API is turned On for your project.
Navigate to Credentials and create a New Client ID.
Select Application Type – Installed Application.
Once your Client ID and Client Secret are created, copy them to your R Script.
client.id <- "xxxxxxxxxxxxxxxxxxxxxxxxx"
client.secret <- "xxxxxxxxxxxxxxx"
token <- Auth(client.id,client.secret)
Save the token object for future sessions
save(token,file="./token_file")
In future sessions, you need not generate the Access Token every time. Assumming that you have saved it to a file,
it can be loaded via the following snippet -
load("./token_file")
Validate and refresh the token
ValidateToken(token)
Step 3: Build required query
query.list <- Init( start.date = "2014-08-01",
end.date = "2014-09-01",
dimensions = "ga:sourceMedium",
metrics = "ga:sessions,ga:transactions",
max.results = 10000,
sort = "-ga:transactions",
table.id = "ga:0000000")
Create the Query Builder object so that the query parameters are validated
ga.query <- QueryBuilder(query.list)
Extract the data and store it in a data-frame
ga.data <- GetReportData(ga.query, token,paginate_query = FALSE)
Handy Links
Common Errors: developers.google.com/analytics/devguides/reporting/core/v3/coreErrors#standard_errors
Query Explorer:
ga-dev-tools.appspot.com/query-explorer/?csw=1
Dimensions and metrics:
developers.google.com/analytics/devguides/reporting/core/dimsmets

Answer 2

It seems that this error appears when the Rjson library isn't able to parse Google Analytics JSON Feed properly. Please try out the recently released and updated version of the RGoogleAnalytics library from CRAN.