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Advance Research Methods. Vishnu Parmar Assistant Professor, IBA University of Sindh, Jamshoro. WHAT IS STATISTICS?. Definition Statistics is a group of methods used to collect, analyze, present, and interpret data and to make decisions. What is statistics?.

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Advance research methods

Advance Research Methods

Vishnu Parmar

Assistant Professor, IBA

University of Sindh, Jamshoro


What is statistics
WHAT IS STATISTICS?

  • Definition

  • Statistics is a group of methods used to collect, analyze, present, and interpret data and to make decisions.


What is statistics1
What is statistics?

a branch of mathematics that provides techniques to analyze whether or not your data is significant (meaningful)

Statistical applications are based on probability statements

Nothing is “proved” with statistics

Statistics are reported

Statistics report the probability that similar results would occur if you repeated the experiment


Why statistics
Why Statistics ?

  • "The objective of a national statistical system is to provide relevant, comprehensive, accurate and objective statistical information. Generally, statistics are valuable for monitoring the country’s economic and social conditions, the planning and evaluation of government and private sector programmes and investment, policy debates and advocacy, and the creation and maintenance of an informed public."


Why statistics cont d
Why Statistics ? Cont’d

Essential in:

  • Official decision-making, policy formulation

  • Policy Analysis & Research

  • Academic, business, industrial & other research

  • Business planning & CRM

  • Citizens/residents being informed about performance of governments


Why statistics1
Why Statistics ?

  • Facilitate comparison across countries/regions

  • Benchmarking

  • ‘Best Practices’

  • Evaluation of performance

    However, good statistics must be collected in accordance with agreed international standards using appropriate methods for data collection, processing and dissemination.


Types of statistics
TYPES OF STATISTICS

  • Definition

  • Descriptive Statistics consists of methods for organizing, displaying, and describing data by using tables, graphs, and summary measures.


Types of statistics1
TYPES OF STATISTICS

  • Definition

  • Inferential Statistics consists of methods that use sample results to help make decisions or predictions about a population.


Population versus sample
POPULATION VERSUS SAMPLE

  • Definition

  • A population consists of all elements – individuals, items, or objects – whose characteristics are being studied. The population that is being studied is also called the target population.


Population versus sample cont
POPULATION VERSUS SAMPLE cont.

  • Definition

  • A portion of the population selected for study is referred to as a sample.


Figure 1 1 population and sample
Figure 1.1 Population and sample.

Population

Sample


Population versus sample cont1
POPULATION VERSUS SAMPLE cont.

  • Definition

  • A survey that includes every number of the population is called a census. The technique of collecting information from a portion of the population is called a sample survey.


Population versus sample cont2
POPULATION VERSUS SAMPLE cont.

  • Definition

  • A sample that represents the characteristics of the population as closely as possible is called a representative sample.


Population versus sample cont3
POPULATION VERSUS SAMPLE cont.

  • Definition

  • A sample drawn in such a way that each element of the population has a chance of being selected is called a random sample. If the chance of being selected is the same for each element of the population, it is called a simple random sample.


Types of variables
TYPES OF VARIABLES

  • Quantitative Variables

    • Discrete Variables

    • Continuous Variables

  • Qualitative or Categorical Variables


Quantitative variables
Quantitative Variables

  • Definition

  • A variable that can be measured numerically is called a quantitative variable. The data collected on a quantitative variable are called quantitative data.


Quantitative variables cont
Quantitative Variables cont.

  • Definition

  • A variable whose values are countable is called a discrete variable. In other words, a discrete variable can assume only certain values with no intermediate values. (e.g, 100 students in section A, or 2 or 3 bedrooms in an apartment, there won’t be 2.5. in an home)


Quantitative variables cont1
Quantitative Variables cont.

  • Definition

  • A variable that can assume any numerical value over a certain interval or intervals is called a continuous variable. (e.g, 1.5kg bag of rice, or flight is late for 2 hrs and 30 min.)


Qualitative or categorical variables
Qualitative or Categorical Variables

  • Definition

  • A variable that cannot assume a numerical value but can be classified into two or more nonnumeric categories is called a qualitative or categorical variable. The data collected on such a variable are called qualitative data.


Qualitative attitude or categorical variables cont
Qualitative, attitude, or Categorical Variables, cont…

  • Qualitative data is often summarized in bar graphs and charts

  • E.g, % of minority population in an area

    • What % of population has blue eyes?

    • What % of women is highly educated?


Figure 1 2 types of variables
Figure 1.2 Types of variables.


Levels of measurement
Levels of Measurement

  • Measurement is the process of assigning numbers to quantities. The process is so familiar that perhaps we often overlook its fundamental characteristics.


Levels or scales of measurement
Levels (or Scales) of Measurement

Measurement is a process whereby values (scores) are

assigned to properties of people, places, things, or events.

You might rate preferences of perfumes or TV show. You

may collect data about marital status or gender, or count

the number of times people report feeling depressed.

These different measures all have different properties,

which in turn, lead to different sorts of appropriate

Statistical tests. The level of measurement refers to the

amount of information the measurement procedure can

convey about the actual quantity of the variable present

and about the differences individuals with different scores.


Properties of numbers and attributes
Properties of Numbers and Attributes

  • Nominal (Same-Different). My income is the same as yours or different.

  • Ordinal (Ordering). If our incomes are different, mine is greater or less than yours.

  • Interval (Relative Differences). The difference between my income and yours might be, say, twice as great as the different between my income and the governor’s.

  • Ratio (Ratios and Zero Point). My brother’s income is about 10 times what mine is.


Levels or scales of measurement1
Levels (or Scales) of Measurement

1. Nominal scale: based on categories or names,

and tells us nothing about magnitude.

2. Ordinal scale: a rank-order scale that reflects

differences in magnitude, but the intervals

between values may not be equal and there is

no absolute zero.

3. Interval scale: also measures magnitude and has

equal intervals between values, but the scale

has no absolute zero.

4. Ratio scale: Has equal intervals between all its

values and an absolute zero point.


Nominal scale
Nominal Scale

The nominal scale is the most basic. It seeks to

name things, to categorize or classify them.

Nominal scales satisfy only the property of

identity. Examples are gender, job title, religion,

marital status, etc. Numbers can also be used to

identify or categorize, such as

the numbers of players on the football team. The

numbers themselves do not indicate magnitude,

and it would make no sense to try to add or

multiply the numbers on football jerseys.


Properties of nominal data
Properties of Nominal Data

  • Data categories are mutually exclusive, so an object belongs to only category

  • Data Category have logical order


Mutually exclusive and exhaustive
Mutually Exclusive and Exhaustive

Mutually Exclusive means an individual, object, or measurement is included in only category

Exhaustive: Each individual object or measurement must appear in a category


Ordinal scale
Ordinal Scale

The ordinal scale of measurement deals with order or ranking. Common examples are the grades of A, B, C, D, and F; the “top 20” ratings for sports teams; the “top 40” ratings for music.

While an ordinal scale allows us to know which

category is larger, higher, or better, it does not

allow us to say anything about the interval

between the rankings, or how much better one

team or song is than another. The only

mathematical operation allowed on ordinal data

is ranking.


Properties of ordinal level data
Properties of Ordinal Level Data

  • The data categories are mutually exclusive and exhaustive

  • Data categories are ranked or ordered according to the particular trait they possess


Interval scale
Interval Scale

The interval scale of measurement tells us about the rank

order and about the intervals between the numbers. On an

interval scale, a difference of 1 point always means the

same thing. Temperatures measured with either the

Celsius or Fahrenheit scales provide scores on an interval

scale. However, these thermometers do not have true zero

points: a temperature of 0° does not mean the absence of

heat. The mathematical operations allowed are addition

and subtraction, but never multiplication or division. 80° is

not twice as hot as 40°


Properties of interval level data
Properties of Interval Level Data

  • Data categories are mutually exclusive and exhaustive

  • Data categories are scaled according to the amount of the characteristics they possess

  • Equal difference in the characteristic are represented by the equal differences in the numbers assigned to the categories


Ratio level
Ratio Level

  • It is highest level of measurement

  • It has all characteristics of interval level but in addition the zero (o) point is meaningful, and the ratio between two numbers is meaningful

    E.g, wages, Units of Production, Weight, and Height


Properties of ratio level data
Properties of Ratio Level Data

  • Data Categories are mutually exclusive and exhaustive

  • Data Categories are scaled according to the amount of the characteristics they possess

  • Equal difference in the characteristic are represented by equal differences in the numbers assigned to the categories

  • The point 0 reflects the absence of the characteristic


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