## Wednesday, 11 March 2015

### Quantitative Techniques and Management Information Systems interfacing.

Meaning and Definition:
Quantitative techniques may be defined as those techniques which provide the decision makes a systematic and powerful means of analysis, based on quantitative data. It is a scientific method employed for problem solving and decision making by the management. With the help of quantitative techniques, the decision maker is able to explore policies for attaining the predetermined objectives. In short, quantitative techniques are inevitable in decision-making process.

Classification of Quantitative Techniques:
There are different types of quantitative techniques. We can classify them into three categories. They are:
1. Mathematical Quantitative Techniques
2. Statistical Quantitative Techniques
3. Programming Quantitative Techniques

Mathematical Quantitative Techniques:
A technique in which quantitative data are used along with the principles of mathematics is known as mathematical quantitative techniques.
Mathematical quantitative techniques involve:
1. Permutations and Combinations:
Permutation means arrangement of objects in a definite order. The number of arrangements depends upon the total number of objects and the number of objects taken at a time for arrangement. The number of permutations or arrangements is calculated by using the formula.
Combination means selection or grouping objects without considering their order. The number of combinations is calculated by using the formula.

2. Set Theory:-
Set theory is a modern mathematical device which solves various types of critical problems.

3. Matrix Algebra:
Matrix is an orderly arrangement of certain given numbers or symbols in rows and columns. It is a mathematical device of finding out the results of different types of algebraic operations on the basis of the relevant matrices.
4. Determinants:
It is a powerful device developed over the matrix algebra. This device is used for finding out values of different variables connected with a number of simultaneous equations.
5. Differentiation:
It is a mathematical process of finding out changes in the dependent variable with reference to a small change in the independent variable.
6. Integration:
Integration is the reverse process of differentiation.
7. Differential Equation:
It is a mathematical equation which involves the differential coefficients of the dependent variables.
Statistical Quantitative Techniques:
Statistical techniques are those techniques which are used in conducting the statistical enquiry concerning to certain Phenomenon. They include all the statistical methods beginning from the collection of data till interpretation of those collected data.
Statistical techniques involve:
1. Collection of data:
One of the important statistical methods is collection of data. There are different methods for collecting primary and secondary data.
2. Measures of Central tendency, dispersion, skewness and Kurtis
Measures of Central tendency is a method used for finding he average of a series while measures of dispersion used for finding out the variability in a series. Measures of Skewness measures asymmetry of a distribution while measures of Kurtis measures the flatness of peakedness in a distribution.
3. Correlation and Regression Analysis:
Correlation is used to study the degree of relationship among two or more variables. On the other hand, regression technique is used to estimate the value of one variable for a given value of another.
4. Index Numbers:
Index numbers measure the fluctuations in various Phenomena like price, production etc over a period of time, They are described as economic barometres.
5. Time series Analysis:
Analysis of time series helps us to know the effect of factors which are responsible for changes:
6. Interpolation and Extrapolation:
Interpolation is the statistical technique of estimating under certain assumptions, the missing figures which may fall within the range of given figures. Extrapolation provides estimated figures outside the range of given data.
7. Statistical Quality Control
Statistical quality control is used for ensuring the quality of items manufactured. The variations in quality because of assignable causes and chance causes can be known with the help of this tool. Different control charts are used in controlling the quality of products.
8. Ratio Analysis:
Ratio analysis is used for analyzing financial statements of any business or industrial concerns which help to take appropriate decisions.
9. Probability Theory:
Theory of probability provides numerical values of the likely hood of the occurrence of events.
10. Testing of Hypothesis
Testing of hypothesis is an important statistical tool to judge the reliability of inferences drawn on the basis of sample studies.
Programming Techniques:
Programming techniques are also called operations research techniques. Programming techniques are model building techniques used by decision makers in modern times. Programming techniques involve:
1. Linear Programming:
Linear programming technique is used in finding a solution for optimizing a given objective under certain constraints.
2. Queuing Theory:
Queuing theory deals with mathematical study of queues. It aims at minimizing cost of both servicing and waiting.
3. Game Theory:
Game theory is used to determine the optimum strategy in a competitive situation.
4. Decision Theory:
This is concerned with making sound decisions under conditions of certainty, risk and uncertainty.
5. Inventory Theory:
Inventory theory helps for optimizing the inventory levels. It focuses on minimizing cost associated with holding of inventories.
6. Net work programming:
It is a technique of planning, scheduling, controlling, monitoring and co-ordinating large and complex projects comprising of a number of activities and events. It serves as an instrument in resource allocation and adjustment of time and cost up to the optimum level. It includes CPM, PERT etc.
7. Simulation:
It is a technique of testing a model which resembles a real life situations
8. Replacement Theory:
It is concerned with the problems of replacement of machines, etc due to their deteriorating efficiency or breakdown. It helps to determine the most economic replacement policy.
9. Non Linear Programming:
It is a programming technique which involves finding an optimum solution to a problem in which some or all variables are non-linear.
10. Sequencing:
Sequencing tool is used to determine a sequence in which given jobs should be performed by minimizing the total efforts.
Quadratic programming technique is designed to solve certain problems, the objective function of which takes the form of a quadratic equation.
12. Branch and Bound Technique
It is a recently developed technique. This is designed to solve the combination problems of decision making where there are large number of feasible solutions. Problems of
plant location, problems of determining minimum cost of production etc. are examples of
combination problems.

Functions of Quantitative Techniques:
The following are the important functions of quantitative techniques:
1. To facilitate the decision-making process
2. To provide tools for scientific research
3. To help in choosing an optimal strategy
4. To enable in proper deployment of resources
5. To help in minimizing costs
6. To help in minimizing the total processing time required for performing a set of jobs

USES OF QUANTITATIVE TECHNIQUES
Quantitative techniques render valuable services in the field of business and industry. Today, all decisions in business and industry are made with the help of quantitative techniques.
Some important uses of quantitative techniques in the field of business and industry are given below:
1. Quantitative techniques of linear programming is used for optimal allocation of scarce resources in the problem of determining product mix
2. Inventory control techniques are useful in dividing when and how much items are to be purchase so as to maintain a balance between the cost of holding and cost of ordering the inventory
3. Quantitative techniques of CPM, and PERT helps in determining the earliest and the latest times for the events and activities of a project. This helps the management in proper deployment of resources.
4. Decision tree analysis and simulation technique help the management in taking the best possible course of action under the conditions of risks and uncertainty.
5. Queuing theory is used to minimize the cost of waiting and servicing of the customers in queues.
6. Replacement theory helps the management in determining the most economic replacement policy regarding replacement of an equipment.

Limitations of Quantitative Techniques:
Even though the quantitative techniques are inevitable in decision-making process, they are not free from short comings. The following are the important limitations of quantitative techniques:
1. Quantitative techniques involves mathematical models, equations and other mathematical expressions
2. Quantitative techniques are based on number of assumptions. Therefore, due care must be ensured while using quantitative techniques, otherwise it will lead to wrong conclusions.
3. Quantitative techniques are very expensive.
4. Quantitative techniques do not take into consideration intangible facts like skill, attitude etc.
5. Quantitative techniques are only tools for analysis and decision-making. They are not decisions itself.

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