Anybody can answer The software can read multiple formats and perform. Note that when you change data, Prism updates the results and the graphs. JASP, a low fat alternative to SPSS, a delicious alternative to R.
That is built-in to the Prism project (or template). It might also be possible to do this with fewer plotting calls, but I can't figure that out either. Pathomx is a workflow-based tool for the analysis and visualisation of experimental data. I didn't changed too many things, just separated the logic into three different functions and added a As for the plotting calls, you kinda' can't change the number of calls. But other programs can launch a Prism script.