smoothing1.vl

{
    "$schema": "https://vega.github.io/schema/vega-lite/v4.json",
    "data": {
        "url": "https://vega.github.io/vega-lite/data/movies.json"
    },
    "description": "How can we 'smooth' data?",
    "encoding": {
        "x": {
            "field": "Rotten_Tomatoes_Rating",
            "type": "quantitative"
        },
        "y": {
            "field": "IMDB_Rating",
            "type": "quantitative"
        }
    },
    "height": 300,
    "layer": [
        {
            "mark": {
                "filled": true,
                "opacity": 0.3,
                "type": "point"
            }
        },
        {
            "mark": {
                "color": "firebrick",
                "type": "line"
            },
            "transform": [
                {
                    "bandwidth": 0.1,
                    "loess": "IMDB_Rating",
                    "on": "Rotten_Tomatoes_Rating"
                }
            ]
        },
        {
            "mark": {
                "color": "orange",
                "type": "line"
            },
            "transform": [
                {
                    "extent": [
                        10,
                        90
                    ],
                    "method": "poly",
                    "on": "Rotten_Tomatoes_Rating",
                    "order": 3,
                    "regression": "IMDB_Rating"
                }
            ]
        }
    ],
    "width": 300
}