Package nltk :: Module probability :: Class MLEProbDist

Class MLEProbDist

object --+    
         |    
 ProbDistI --+
             |
            MLEProbDist

The maximum likelihood estimate for the probability distribution of the experiment used to generate a frequency distribution. The maximum likelihood estimate approximates the probability of each sample as the frequency of that sample in the frequency distribution.

Instance Methods

[hide private]

__init__(self, freqdist)
Use the maximum likelihood estimate to create a probability distribution for the experiment used to generate freqdist. source code

FreqDist

freqdist(self)
Returns: The frequency distribution that this probability distribution is based on.

source code

float

prob(self, sample)
Returns: the probability for a given sample.

source code

any

max(self)
Returns: the sample with the greatest probability.

source code

list

samples(self)
Returns: A list of all samples that have nonzero probabilities.

source code

string

__repr__(self)
Returns: A string representation of this ProbDist. source code

Inherited from ProbDistI: discount, generate, logprob

Inherited from object: __delattr__, __getattribute__, __hash__, __new__, __reduce__, __reduce_ex__, __setattr__, __str__

Class Variables

[hide private]

Inherited from ProbDistI: SUM_TO_ONE

Properties

[hide private]

Inherited from object: __class__

Method Details

[hide private]

init(self, freqdist)
(Constructor)

source code

Use the maximum likelihood estimate to create a probability distribution for the experiment used to generate freqdist.

Parameters:

freqdist (FreqDist) - The frequency distribution that the probability estimates should be based on.

Overrides: ProbDistI.__init__

freqdist(self)

source code

Returns: FreqDist: The frequency distribution that this probability distribution is based on.

prob(self, sample)

source code

Parameters:

sample - The sample whose probability should be returned.

Returns: float

the probability for a given sample. Probabilities are always real numbers in the range [0, 1].

Overrides: ProbDistI.prob

(inherited documentation)

max(self)

source code

Returns: any: the sample with the greatest probability. If two or more samples have the same probability, return one of them; which sample is returned is undefined.
Overrides: ProbDistI.max: (inherited documentation)

samples(self)

source code

Returns: list: A list of all samples that have nonzero probabilities. Use prob to find the probability of each sample.
Overrides: ProbDistI.samples: (inherited documentation)

repr(self)
(Representation operator)

source code

repr(x)

Returns: string: A string representation of this ProbDist.
Overrides: object.__repr__

Class MLEProbDist

__init__(self, freqdist) (Constructor)

freqdist(self)

prob(self, sample)

max(self)

samples(self)

__repr__(self) (Representation operator)

init(self, freqdist)
(Constructor)

repr(self)
(Representation operator)