# All Questions

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### How to use XGboost.cv with hyperparameters optimization?

I want to optimize hyperparameters of XGboost using crossvalidation. However, it is not clear how to obtain the model from xgb.cv. For instance I call ...
7 views

### how to do logistic curve fitting? [on hold]

I have two array of data X = 250, 500, 750, 1000, 1250, 1500, 1750 Y = 0.97, 2.02, 0.07, 1.58, 1.35, 1.33, 1.81, 0.49 and how to get statistics data after doing logistic curve fitting. Please help. ...
4 views

### How do you evaluate the performance of a classifier if its F1 is higher for one class but low for another?

For a binary classifier, how do I evaluate the performance if I'm getting very high precision & recall values (~0.9) for one class, say A, but lower (~0.5-0.6) values for the other class, say B? ...
8 views

### Valid testing of a predictive model by regression - can the intercept be set to (0,0)?

I have an ecosystem model which predicts an increase in a measurable variable (R). I run the model for 1910 locations and it predicts a value of R for each. The I want to compare the predictions ...
14 views

### Probability distribution of randomly drawn summed ranks

I have a sequence of N unique values which are ranked 1 to N. A subset are those in positions 1 to n where n < N. An ideal system of ordering would put the lowest ranks 1 to n in the first n ...