I need some help understanding how on of the example data sets is
formatted in the basic R installation. If I load the Mona Loa CO2
data, with the command:
> data(co2)
I can view the data with:
> co2
And the data are in the form of 11 rows labeled as years (1994-2004)
and 12 columns labeled (Jan - Dec). This structure appears to be a
dataframe, however, if I type the command
> plot(co2)
I get a time series with CO2 on the x axis and time on the y. Also,
> summary(co2) gives a single Min, Median, Max.
The reason for my confusion is that I created another "similar
looking" data set with read.table. In that case, the data looks to be
in same format (rows as years, and columns as months). However, the
command
> summary(test.data)
gives a summary for each month. Completely different behavior.
If use the data.frame command:
> data.frame(co2)
I get a single column of CO2 data, while the data.frame command on my
test.data data, keeps it's year-row, column-month format.
Can anyone help me understand the differences in how these data sets
are formatted?
Thanks in advance.
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