Set categorical axis labels
\begin{axis}
[
xticklabels={master, g8, lehrer, promovieren, sport, sitzenbleiben},
xtick={1,...,6},
x tick label style={rotate=90,anchor=east}
]
...
\end{axis}
Read data from file
The data file needs to be tab-separated. The first column is treated as x-value.
\pgfplotstableread{data.csv}\datatable
\begin{axis}
\addplot table[y = myColumn] from \datatable;
\addlegendentry{Results from myColumn};
\end{axis}
Use percentage as axis label
If the y-values are given in a range of, say, 0.0 to 1.0, the following command displays them as 0% to 100% on the y-axis.
\begin{axis}
[
yticklabel={\pgfmathparse{\tick*100}\pgfmathprintnumber{\pgfmathresult}\%},
]
...
\end{axis}
Do not connect data points with lines (scatter plot)
\begin{axis}
[
only marks
]
...
\end{axis}