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Chris, many thanks for your response, and offer of help, much appreciated. I managed to get the power table output via R (MLwiN didn't like the other macros either). Struggled to graph the curves in R also, not sure why it didn't like the code. Got the data into SPSS and then plotted the curves ...

I'm trying to graph power curves after creating macros from MLPowSim. These are for power calculations for a two-level logistic regression model.

After inputting the relevant parameters into MLPowSim I have tried to open the resultant graphs.txt macro in MLwiN, as per the instruction manual ...