Charts

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This page was translated from the Dutch-language original using AI and has not been fully reviewed. Where the two differ, the Dutch version takes precedence.

Can I change the whiskers of my boxplots?

I have a question about drawing a chart: with the box-plot option in SPSS, I get whiskers that do not show the 10th and 90th percentiles, and I would like them to. Is this possible in another program, for example Prism?

In SPSS and many other statistical programs, you indeed cannot change the boxplots. This is because the whiskers of boxplots in principle have a fixed length, so that everyone knows how to interpret them. It is therefore not very common to use the 10th and 90th percentile for this.

In Prism it does work that way, but in the meantime I have convinced my boss that the SPSS way is also fine!

How can I plot overlapping observations in SPSS?

I am working on creating scatterplots, but my data contains many overlapping observations. I would like to have 1 dot per observation in my plot. I know that SPSS used to have a function for jittered observations in IGRAPH. However, this doesn't work (anymore?). Searching the internet, I find something about GGRAPH as a replacement for the IGRAPH command, but I can't find a working syntax command.

On this webpage you will find example syntax for creating a jittered plot with GGRAPH. You can find GGRAPH in the menu structure under Graphs -> Chart builder. Through the Chart Builder you can specify all kinds of settings for the plot. If, in the resulting syntax, you replace the last line ELEMENT: point with ELEMENT: point.jitter, you get jittered points. Note that this jitters the points in both the x and y direction. Another option is to use ELEMENT: point.dodge.symmetric, which only places points side by side in the direction where there were identical y values.

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