Skip to main content

Explain the concept of Validity and Reliability in Measurement?


Validity

The concept of validity is to find accurate information without any unnecessary things,There are many ways to assess the validity of instrument/results ,The concept of validity explains that whether the collected result is free from errors or not it also determine whether the result is 100% accurate or not so validation involves collecting and analyzing resulting data to assess the accuracy of an instrument. Validity is the extent to which an instrument measures what it is supposed to measure and performs as it is designed to perform. It is rare, if nearly impossible, that an instrument be 100% valid, so validity is generally measured in degrees. As a process,

External validity helps obtain the degree to which a sample represents the population.
Content validity refers to the appropriateness of the content of an instrument. In other words, do the measures (questions, observation logs, etc.) accurately assess what you want to know.

Reliability

Reliability checks the consistency of an instrument and explain does the instrument consistently measure what it is intended to measure, It is not possible to calculate reliability.

Reliability is directly related to the validity of the measure. There are several important principles. First, a test can be considered reliable, but not valid. Consider the SAT, used as a predictor of success in college. It is a reliable test (high scores relate to high GPA), though only a moderately valid indicator of success (due to the lack of structured environment – class attendance, parent-regulated study, and sleeping habits – each holistically related to success).

Labels

Labels:

Comments

Post a Comment

Popular posts from this blog

Difference between Downsizing and Reengineering with real life example

Explain difference between Downsizing and Re-engineering with real life example? Downsizing = Downsizing is used to reduce the size in order to improve its financial performance, usually by laying off employees.Businesses use several techniques in downsizing, including providing incentives to take early retirement and transfer to subsidiary companies, but the most common technique is to simply terminate the employment of a certain number of people. Downsizing often takes place as part of a larger restructuring program at a company. Although it's usually thought of as a strategy companies use to become smaller, downsizing can also be the result of company mergers, acquisitions, and takeovers.Its most common form comes in employee layoffs, which reduce payroll costs for the company. Downsizing may also involve shuttering some operations or offering certain employees early retirement. Downsizing is typically seen during economic downturns in order to improve efficienc...
5 comments
Read more

What are the Crosby’s 14 Steps Work.

The 14 Steps of Crosby are following. 1. Management Commitment= It is necessary to consistently produce quality products and services at the optimum price. This commitment must also be transparent to all employees for the prevention of defects in all the operating departments. 2. Improved Quality= Search for team members who will model quality improvement commitment, every function of an operation must contributes to defect levels, every function must participate in the quality improvement effort . The quality improvement team should be able to effectively commit themselves to improvement of quality. 3. Measuring the Quality= Firstly you have to know exactly where your products and services lie when it comes to conforming to requirements. Thus, the third step on Crosby's list is to measure quality. Determine where there is room for improvement and where potential for improvement exists. 4. Cost of Quality= Explain how the cost of quality figures into the overal...
1 comment
Read more

Discuss national income and Gross domestic product effect on national income.

Discuss national income and Gross domestic product effect on national income. Before we start to explain let’s take a look on closed and open economy In a closed economy, all output is sold domestically, and expenditure is divided into three components: consumption, investment, and government purchases. Y = C + I + G In this equation Y is the total output, C is the total consumption, I is the total investment and G is the total government expenditure. In an open economy, some output is sold domestically and some are exported abroad.                                                                   Y = C + I + G + NX In the above equation each word stands for is following: Consumption (C) Investment (I) Government Purchases (G) Net Exports (NX) Consumption : The spending by households on goods and services, with the exc...
Post a Comment
Read more