Question

我有多个数据集，其中响应变量始终位于数据帧的最后一列。我想运行GLM（逻辑回归）并将其自动化。我按位置调用glm()，但是此方法始终包含最后一个变量。

data(iris)
head(iris) 
train<- iris 
logit <- glm(train[,length(train)]~ . , 
             data = train, family = "binomial")
summary(logit)

我尝试写train[,length(train)]~ . -train[,length(train)]，但不起作用。

Answer 1

非常冗长，但我认为应该可以：

import UIKit

class List: UICollectionViewController {

    lazy var refresher: UIRefreshControl = {
        ...
    }()

    @IBOutlet var movieCollectionView: UICollectionView!
    @IBOutlet weak var flowLayout: UICollectionViewFlowLayout!

    var movies: [Movie] = [Movie]()

    override func viewDidLoad() {
        super.viewDidLoad()

        movieCollectionView.refreshControl = refresher
        ...
    }

    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        fetchMovies()
    }


// Update Movies List
    @objc func fetchMovies() {
        ViewController.sharedInstance().fetchMovies { (movies) in
            if let movies = movies {
                self.movies = movies
                DispatchQueue.main.async {
                    self.movieCollectionView.reloadData()
                }
            } else {
                print("error occured while fetching movies")
            }
        }

        let deadline = DispatchTime.now() + .milliseconds(700)
        DispatchQueue.main.asyncAfter(deadline: deadline) {
            self.refresher.endRefreshing()
        }
    }


// CollectionView Functions
    override func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        return movies.count
    }

    override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {

        let cellReuseIdentifier = "collectionCell"
        let movie = movies[indexPath.row]
        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: cellReuseIdentifier, for: indexPath) as! CustomCollectionViewCell

        cell.poster!.contentMode = UIView.ContentMode.scaleAspectFit

        if let posterPath = movie.posterPath {
            ViewController.sharedInstance().fetchPoster(path: posterPath, size: ViewController.PosterConstants.RowPoster, completion: { (imageData) in
                if let image = imageData {
                    DispatchQueue.main.async {
                        cell.poster!.image = image
                    }
                } else {
                    print("error")
                }
            })
        }
        return cell
    }

    override func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
        let controller: Detail = storyboard?.instantiateViewController(withIdentifier: "Detail") as! Detail
        controller.movie = movies[indexPath.row]
        navigationController?.pushViewController(controller, animated: true)
    }

    override func numberOfSections(in collectionView: UICollectionView) -> Int {
        var numberOfSections = 0
        if movies.count > 0 {
            numberOfSections = 1
            collectionView.backgroundView = nil

        } else {
            ...
            noDataLabel.text = "Please wait... I'm thinking..."
            ...
        }
        return numberOfSections
    }


}

或使用logit <- glm(formula(paste0(names(train)[length(train)], '~.')), data = train, family = "binomial")：

tail

从glm（）中排除变量

1 个答案: