A Appendix A

jamovi classifies data variables in four classes:

• Nominal : categorical factor, it is passed to the R engine as a factor. Its behavior in jamovi interface depends on the Data Type property. We have

  • Data Type: integer it can be inserted in input field that permit numerical variable and nominal variables
  • Data Type: text it can be inserted in input field that permit nominal variables
  • Data Type: decimal it does not exist. Setting Data Type to decimal makes the variable a continuous type

• Continuous : numerical variable, it is passed to the R engine as a number. It can be input in the variable field that permit numerical variable. The data type property behaves like this:

  • Data Type: integer it rounds the values to the closer integer
  • Data Type: decimal allows for floating points
  • Data Type: text it does not exist, setting Data Type to text transforms the variable into a nominal variable

• Ordinal : numerical variable, it is passed to the R engine as a ordered factor. It can be input in the variable field that permit numerical and ordinal variables variable. The data type property behaves like this:

  • Data Type: integer it can be inserted in input field that permit numerical variable and nominal variables
  • Data Type: text it can be inserted in input field that permit nominal variables
  • Data Type: decimal it does not exist. Setting Data Type to decimal makes the variable a continuous type

• ID : something cool which I do not know about.