db.models.Variance

class Variance(expression, sample=False, **extra) [source]

Returns the variance of the data in the provided expression.

Default alias: <field>__variance
Return type: float

Has one optional argument:

sample: By default, Variance returns the population variance. However, if sample=True, the return value will be the sample variance.

SQLite

SQLite doesn’t provide Variance out of the box. An implementation is available as an extension module for SQLite. Consult the SQlite documentation for instructions on obtaining and installing this extension.

Links:

https://docs.djangoproject.com/en/1.10/ref/models/querysets/#django.db.models.Variance

doc_Django

2016-10-09 18:36:26

Comments

Popular Articles

db.models.Variance.sample sample By default, Variance returns the population variance. However, if sample=True, the return value will be the sample variance. SQLite SQLite

db.models.Model class Model(**kwargs) [source] The keyword arguments are simply the names of the fields you’ve defined on your model. Note that instantiating a mo

db.models.Model.pk Model.pk Regardless of whether you define a primary key field yourself, or let Django supply one for you, each model will have a property called p

db.models.Model.clean() Model.clean() [source] This method should be used to provide custom model validation, and to modify attributes on your model if desired. For insta

db.models.Field.model Field.model Returns the model on which the field is defined. If a field is defined on a superclass of a model, model will refer to the superclass,