# What are the 2 main systems of measurement?

## What are the 2 main systems of measurement?

Systems of Measurement: there are two main systems of measurement in the world: the Metric (or decimal) system and the US standard system. In each system, there are different units for measuring things like volume and mass.

**How many different units of measurement are there?**

There are seven basic units in the SI system: the meter (m), the kilogram (kg), the second (s), the kelvin (K), the ampere (A), the mole (mol), and the candela (cd).

**What are type of measurements?**

You can see there are four different types of measurement scales (nominal, ordinal, interval and ratio). Each of the four scales, respectively, typically provides more information about the variables being measured than those preceding it.

### Is gender ordinal or nominal?

A nominal variable (as in “noun”) cannot be counted. For example, gender is a nominal variable having two categories (male and female) and there is no intrinsic ordering to the categories. You can assign a numerical value (e.g “Male” = 1, “Female” = 2) but you cannot rank the data from highest to lowest.

**Is yes no nominal or ordinal?**

In research activities a YES/NO scale is nominal. It has no order and there is no distance between YES and NO. There are also highly sophisticated modelling techniques available for nominal data. An ordinal scale is next up the list in terms of power of measurement.

**Is gender nominal ordinal interval or ratio?**

Characteristics of Nominal Variable For example, gender is a nominal variable that can take responses male/female, which are the categories the nominal variable is divided into. A nominal variable is qualitative, which means numbers are used here only to categorize or identify objects.

#### Is Likert scale ordinal or nominal?

The Likert scale is widely used in social work research, and is commonly constructed with four to seven points. It is usually treated as an interval scale, but strictly speaking it is an ordinal scale, where arithmetic operations cannot be conducted.

**Is Likert scale ordinal in SPSS?**

The data produced by Likert type items are, strictly speaking, ordinal data. That means that they can tell us how to rank responses (strongly agree is ‘more’ agreement than agree) , but they do not give us information about the distance between them (strongly agree is not twice as much agreement as agree).

**Is a rating scale ordinal or interval?**

With ordinal data you cannot state with certainty whether the intervals between each value are equal. For example, we often using rating scales (Likert questions). On a 10 point scale, the difference between a 9 and a 10 is not necessarily the same difference as the difference between a 6 and a 7.

## Is age an interval in years?

Interval-level variables are continuous, meaning that each value of the variable is one increment larger than the previous and one smaller than the next value. Age, if measured in years, is a good example; each increment is one year.

**What is the difference between an interval and a ratio?**

The difference between interval and ratio scales comes from their ability to dip below zero. Interval scales hold no true zero and can represent values below zero. For example, you can measure temperature below 0 degrees Celsius, such as -10 degrees. Ratio variables, on the other hand, never fall below zero.

**Is a1c a ratio or interval?**

The glycemia control (HbA1c) represents an interval level of measurement.