There's a couple of things going on. First, your data acquisition loop is only outputting the last value for your Z axis. You will need multiple points to do the analysis you are performing. The data type issue is that you do not have a waveform, but you using a Get Waveform Components node. You will need to wire in a Build Waveform node and set the appropriate timing (dt) based on your milliseconds to wait value. If you do that, you will get rid of the data type issue and your analysis will work.
