I did a Lexical Decision Task using DMDX. For the spc. file (which tells Analyze what to do with the raw data) I specified that responses less than 200ms or more than three standard deviations above a participant's mean be replaced by the mean value for that participant. I believe this is standard practice for a LDT. I need to know how much data was replaced. I am now using a Mac, so I cannot use the DMDX software suite. However, I can open the .das output files in TextEdit but cannot see how outliers have been treated.
DMDX is a software tool used for creating and presenting experiments, while Analyze is a program for analyzing data collected from experiments. To find out about outliers in DMDX data using Analyze, you can follow these steps:
You can also use graphical methods to identify outliers, such as scatter plots or box plots. In Analyze, you can create a scatter plot by selecting "Graphs" from the main menu and then selecting "Scatter/Dot." From there, you can choose the variables you want to plot and customize the plot as needed. In a scatter plot, outliers will appear as data points that are far from the main cluster of points.
Similarly, you can create a box plot by selecting "Graphs" from the main menu and then selecting "Box Plot." Again, you can choose the variables you want to plot and customize the plot as needed. In a box plot, outliers will appear as points that are outside of the "whiskers" that extend from the box.
By using a combination of statistical analyses and graphical methods, you can identify outliers in your DMDX data and determine how to handle them in your analysis.
Thank you Ma'Mon Abu Hammad for your in-depth reply. Unfortunately, Analyze does not run on Macs.
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