can u plz. xplain
cos ans givn is d. socioeconomic status
n i think its a misprint
Three scales of measurement are commonly used in medicine. Nominal, ordinal and numerical.
NOMINAL SCALES: They are used for simplest levels of measurement. Here the data fits into categories, the data can take on only one of the two values; yes or no. E.g. sex, pregnancy status etc. Data evaluated on this scale are also called categorical or qualitative variables. It is measured in percentages or proportions.
ORDINAL SCALES: If there is an inherent order among the categories, the observations are said to be measured on an ordinal scale. E.g. tumor staging – Ca cervix is classified from stage I to stage IV, there is an inherent order in the sense that stage IV Ca is definitely more worse of than stage I. Although order exists among categories, the difference between two adjacent categories is not same through out the scale – e.g. when reading an Apgar score; the difference between a score of 8 and a score of 10 is not of the same magnitude, however, as the difference between a score of 0 and a score of 2.The data is usually expressed as percentages or proportions.
NUMERICAL SCALES: They are scales in which characteristics can be exactly in terms of quantity, e.g. – height, weight, heart rate, and hemoglobin etc. The variables are also called quantitative variables. There are two types of numerical scales: continuous scales, i.e. the variable can take on an infinite number of values between any two numbers, eg height or weight. Discrete scales i.e. the variable can take on only a finite number of integer values, e.g. birth order, number of fractures etc.
I usually follow a simple rule for identifying the type of variable. E.g if the variable in question is A then ask a simple question - "Do you have A?" if the answer is yes/no 'A' is a nominal/ordinal variable. If you can t answer this question (or the question seem ridiculous) its a numerical variable. Now try this with 2 examples - Let 'A' be diabetes. and blood sugar.... you can easily tell the variable type here.
Based on your question above - Sex is the ONLY nominal variable, age and body weight are numerical and SE status is ordinal, the question is a misprint clearly
Three scales of measurement are commonly used in Medicine . Nominal, ordinal and numerical.
NOMINAL SCALES: They are used for simplest levels of measurement. Here the data fits into categories, the data can take on only one of the two values; yes or no. E.g. SEX , pregnancy status etc. Data evaluated on this scale are also called categorical or qualitative variables. It is measured in percentages or proportions.
ORDINAL SCALES: If there is an inherent order among the categories, the observations are said to be measured on an ordinal scale. E.g. tumor staging – Ca cervix is classified from stage I to stage IV, there is an inherent order in the sense that stage IV Ca is definitely more worse of than stage I. Although order exists among categories, the difference between two adjacent categories is not same through out the scale – e.g. when reading an Apgar score; the difference between a score of 8 and a score of 10 is not of the same magnitude, however, as the difference between a score of 0 and a score of 2.The data is usually expressed as percentages or proportions.
NUMERICAL SCALES: They are scales in which characteristics can be exactly in terms of quantity, e.g. – height, weight, heart rate, and hemoglobin etc. The variables are also called quantitative variables. There are two types of numerical scales: continuous scales, i.e. the variable can take on an infinite number of values between any two numbers, eg height or weight. Discrete scales i.e. the variable can take on only a finite number of integer values, e.g. birth order, number of fractures etc.
I usually follow a simple rule for identifying the type of variable. E.g if the variable in question is A then ask a simple question - "Do you have A?" if the answer is yes/no 'A' is a nominal/ordinal variable. If you can t answer this question (or the question seem ridiculous) its a numerical variable. Now try this with 2 examples - Let 'A' be diabetes. and blood sugar.... you can easily tell the variable type here.
Based on your question above - SEX is the ONLY nominal variable, age and body weight are numerical and SE status is ordinal, the question is a misprint clearly
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