请问logistic 输出中_level_和_from_、_into_以及Estimated Probability代表什么？

今天做Logistic回归：
proc logistic data=iris ;
    model species = SepalLength SepalWidth PetalLength PetalWidth;
output out=a p=pre  predprobs=individual;
run;
在输出结果数据集a中有几项看不懂：
1:_FROM_(Formatted Value of the Observed Response)：应该是样本分类
2:_into_（Formatted Value of the Predicted Response)：应该是模型分类结果
3：_LEVEL_(Response Value)：？
4：pre（Estimated Probability）：？
请教！谢谢！

1：The _FROM_ variable contains the formatted value of the observed response.
2：The variable _INTO_ contains the formatted value of the response level with the largest individual predicted probability.
3：_LEVEL_, which indicates the level of the response that the given row of output is referring to. For instance, the value of the cumulative probability variable is the probability that the response variable is as large as the corresponding value of _LEVEL_.
4：it is the predicted event probability. For a cumulative model, it is the predicted cumulative probability (that is, the probability that the response variable is less than or equal to the value of _LEVEL_); and for the generalized logit model, it is the predicted individual probability (that is, the probability of the response category represented by the value of _LEVEL_).