This website is for version 5. You can find the documentation for version 4 here.


class altair.LoessTransform(loess=Undefined, on=Undefined, bandwidth=Undefined, groupby=Undefined, **kwds)#

LoessTransform schema wrapper

loessstr, FieldName

The data field of the dependent variable to smooth.

onstr, FieldName

The data field of the independent variable to use a predictor.


A bandwidth parameter in the range [0, 1] that determines the amount of smoothing.

Default value: 0.3

groupbySequence[str, FieldName]

The data fields to group by. If not specified, a single group containing all data objects will be used.

asSequence[str, FieldName]

The output field names for the smoothed points generated by the loess transform.

Default value: The field names of the input x and y values.

__init__(loess=Undefined, on=Undefined, bandwidth=Undefined, groupby=Undefined, **kwds)#


__init__([loess, on, bandwidth, groupby])

copy([deep, ignore])

Return a copy of the object

from_dict(dct[, validate, _wrapper_classes])

Construct class from a dictionary representation

from_json(json_string[, validate])

Instantiate the object from a valid JSON string


Resolve references in the context of this object's schema or root schema.

to_dict([validate, ignore, context])

Return a dictionary representation of the object

to_json([validate, indent, sort_keys, ...])

Emit the JSON representation for this object as a string.

validate(instance[, schema])

Validate the instance against the class schema in the context of the rootschema.

validate_property(name, value[, schema])

Validate a property against property schema in the context of the rootschema