^pof;
Research;
and;
Innovation,;
Tshwane;
University;
of;
Technology,;
P/Bag;
X680,;
Pretoria;
0001,;
Republic;
of;
South;
Africa;
^pof;
Statistics;
and;
Operations;
Research,;
University;
of;
Limpopo,;
P/Bag;
X/106,;
Sovenga;
0727,;
Republic;
of;
South;
Africa;
因果关系; 观测; 二元; logistic回归; 测定; 逻辑回归模型; 卡方检验; 线性模型;