> s_complete$Dotcounting_SNB[s_complete$Dotcounting_SNB == "missing"] <- NA > table(s_complete$Dotcounting_SNB) A-B-C-D A-C-B-D A-D-B-C B-A-C-D B-A-D-C B-C B-C-D-A D-C-B-A missing 2711 80 80 159 80 80 80 159 0

More information about syntax can be found [here](https://help.github.com/articles/basic-writing-and-formatting-syntax/)

# Notes on the data

## Format

The data is in the form of a long table, with each observation representing a
subject with a row.  Observations are grouped into "experiments", with each
observation belonging to one experiment.  Each experiment has a certain number
of columns, and each column is a different question or measurement.

The data file has three columns containing information about the experiment, and
some number of columns containing information about the subjects.  The three
columns are:

1. `experiment`: The name of the experiment.  All the rows that belong to the
   same experiment have the same value in this column.
2. `experiment_name`: The name of the experiment in the form of a sentence.
3. `experiment_description`: A description of the experiment.

## Missing data

If a subject does not answer a question, the corresponding cell in the table
contains the value `missing`.