Concept of measurement
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This document discusses the concept of measurement. It defines measurement as perceiving and understanding characteristics of objects, people, or activities based on specific standards and units. There are four factors of measurement: the object or person being measured, the characteristic being measured, the tools used to measure, and the person doing the measuring. Variables can be qualitative or quantitative, with quantitative variables further divided into continuous and discrete. There are four levels or scales of measurement: nominal, ordinal, interval, and ratio, with each level building on the previous and allowing for more complex analysis and calculations with the data.
Concept of measurement
- 1. Concept of Measurement By Dr.Satish Chand Assistant Professor Department of teacher Education K.M.G.G.PG.College Badalpur G.B,Nagar
- 2. Meaning and definition of measurement • Measurement is the process by which a characteristics of an object,person or activity is perceived andunderstood on specific standards and is described in standard words,symbol and definite units. • Thorndike,1918 “Anything that exists at all,exists in some quantity,anything that exists in some quantity is capable of being measured”. • “Anythingthat exists in mount can be measured.”
- 3. Factors of measurement • The above definition of measurement show that there are four factors of measurement • 1, The object ,person or activity any of which characteristics has to be measured. • 2, The characteristics of that object person or activity which had to be measured. • 3, The tools and devices of measuring such characteristic. • 4, The person who measures it .
- 4. Measuring variables and their types • Variable are two types –Qualitative variables and Quantitative variables • Qualitative variables-Some qualities of objects and person are such which can only be perceived but they can not be measured in definite units,for examplet caste,religion and sex of people. These qualities or characteristics are called qualitative variable. • Quantitative variable-variables-Some qualities of objects and person are such which can be measured in definite units,or quantity, forexample, height,weight,and I.Q.of person .Such qualitities of persons are called quantitative variable. • Quantitative varible are two types • 1 Continuous variables • 2 Descrete variables
- 5. Levels or Scales of measurement • S.S.Stevens has devided the process of measurement in to four level or sclae • 1 ,Noninal scale- The nominal level of measurement is the lowest of the four ways to characterize data. Nominal means "in name only" and that should help to remember what this level is all about. Nominal data deals with names, categories, or labels. • Data at the nominal level is qualitative. Colors of eyes, yes or no responses to a survey, and favorite breakfast cereal all deal with the nominal level of measurement. Even some things with numbers associated with them, such as a number on the back of a football jersey, are nominal since it is used to "name" an individual player • 2 Ordinal scale – The next level is called the ordinal level of measurement. Data at this level can be ordered, but no differences between the data can be taken that are meaningful. • Here you should think of things like a list of the top ten cities to live. The data, here ten cities, are ranked from one to ten, but differences between the cities don't make much sense. There's no way from looking at just the rankings to know how much better life is in city number 1 than city number 2. • Another example of this are letter grades. You can order things so that A is higher than a B, but without any other information, there is no way of knowing how much better an A is from a B. • As with the nominal level, data at the ordinal level should not be used in calculations.
- 6. continue • 3, Interval Scale The interval level of measurement deals with data that can be ordered, and in which differences between the data does make sense. Data at this level does not have a starting point. • The Fahrenheit and Celsius scales of temperatures are both examples of data at the interval level of measurement. You can talk about 30 degrees being 60 degrees less than 90 degrees, so differences do make sense. However, 0 degrees (in both scales) cold as it may be does not represent the total absence of temperature. • Data at the interval level can be used in calculations. • 4 ,Ratio scale The fourth and highest level of measurement is the ratio level. Data at the ratio level possess all of the features of the interval level, in addition to a zero value. Due to the presence of a zero, it now makes sense to compare the ratios of measurements. Phrases such as "four times" and "twice" are meaningful at the ratio level. • Distances, in any system of measurement, give us data at the ratio level. A measurement such as 0 feet does make sense, as it represents no length. Furthermore, 2 feet is twice as long as 1 foot. So ratios can be formed between the data. • At the ratio level of measurement, not only can sums and differences be calculated, but also ratios. One measurement can be divided by any nonzero measurement, and a meaningful number will result.
- 7. Thank you