Find the best tutors and institutes for Data Science

Find Best Data Science Classes

Please select a Category.

Please select a Locality.

No matching category found.

No matching Locality found.

Outside India?

Search for topics

Discrimination, classification and pattern recognition

Rajendra M.
02/07/2018 0 0

The importance of classification in science has already been remarked upon in
Chapter 6, where techniques were described for examining multivariate data for
the presence of relatively distinct groups or clusters of observations. In this
chapter a ·further aspect of the classification problem will be discussed, in
which the groups know a priori, and the aim is to devise rules which can
allocate previously unknown objects or individuals into these groups in an
optimal fashion. In this situation the investigator has one set of multivariate
observations, the training sample, for which group membership is known with
certainty a priori, and a second set, the test sample, consisting of observations
· for which group membership is unknown and which have to be assigned to
one of the known groups as accurately as possible. The information used in
deriving a suitable allocation rule is the variable values of the training
sample. Areas, where this type of classification problem is of importance, are
numerous and include the following.
• Medical diagnosis. Here the variables describing each might be the
results of various clinical tests, and the groups could be collections of patients
known to have different diseases.
• Archaeology. Here the aim might be to decide from which ancient civilisation
a, pottery fragment originates, with the variables being particular measurements
on the artefacts.
• Speech recognition. Here the objects to be classified are usually waveforms,
and the variables a set of acoustical parameters extracted from the utterance
of a specific word by an individual.
An initial question that might be asked is, 'since the members of the training
sample can be classified with certainty, why not apply the procedure used for
their classification to the test sample?'. Reasons are not difficult to identify. In
A simple example 249
Medicine, for example, it might be possible to diagnose a particular condition
with certainty only as a result of a post-mortem examination. Clearly, for
patients still alive and in need of treatment, a different diagnostic rule is
In statistics the type of classification question described in this preamble is
usually referred to as a discrimination or assignment problem.

0 Dislike
Follow 2

Please Enter a comment


Other Lessons for You

What is Time Series?
What is a Time Series? Time Series data is a series of data points indexed or listed or graphed with an equally spaced period. Time series forecasting is the use of the model to predict future values...

Pavan Balaji N | 28 Jul

0 0

Outliers* An Outlier is an observation point that is distant from other observations.* An outlier may indicate an experimental error, or it may be due to variability in the measurement. * Outliers are...

Nitish Vig | 01 Jul

0 0

Regularisation in Machine Learning
Regularization In Machine Learning, Regularization is the concept of shrinking or regularizing the coefficients towards zero. It helps the model to prevent overfitting. Overfitting in Machine Learning...

Mathematics used in various Machine learning concepts
Mathematics is the building block for data science. This blog focuses on various mathematical concepts that are used in machine learning. The mathematical concepts used for machine learning are categorized...

Linear Regression and its types
Linear Regression A Linear regression is a Regression Analysis technique which is used for modeling the predictions on the continuous data. A Linear Regression can be modelled using 1. A Simple Regression...

Looking for Data Science Classes?

Find best tutors for Data Science Classes by posting a requirement.

  • Post a learning requirement
  • Get customized responses
  • Compare and select the best

Looking for Data Science Classes?

Find best Data Science Classes in your locality on UrbanPro

Post your learning requirement is India's largest network of most trusted tutors and institutes. Over 25 lakh students rely on, to fulfill their learning requirements across 1,000+ categories. Using, parents, and students can compare multiple Tutors and Institutes and choose the one that best suits their requirements. More than 6.5 lakh verified Tutors and Institutes are helping millions of students every day and growing their tutoring business on Whether you are looking for a tutor to learn mathematics, a German language trainer to brush up your German language skills or an institute to upgrade your IT skills, we have got the best selection of Tutors and Training Institutes for you. Read more