polychotomous variable
1Dummy variable (statistics) — In statistics and econometrics, particularly in regression analysis, a dummy variable (also known as an indicator variable) is one that takes the values 0 or 1 to indicate the absence or presence of some categorical effect that may be expected to …
2Single-access key — A key in Biology is a modeling method used for categorizing species using logical choices. A single access key (Dichotomous key also called sequential key , analytical key [1], or pathway key ) is a key where the sequence and structure of… …
