Demand forecasting involves estimating future demand for a product or service. There are two main approaches: obtaining expert opinions or consumer surveys, or using past sales data through statistical techniques. Simple survey methods include expert opinion polls, the Delphi technique to reach consensus among experts, and consumer surveys using complete or sample enumeration. More complex statistical methods include time series analysis to identify trends, using leading economic indicators to forecast changes, and correlation/regression analysis to determine relationships between demand and influencing factors like price, income, and advertising. The most sophisticated method is simultaneous equation modeling or developing an econometric model of an entire economy.
In this paper we attempt to review the models, process, qualitative and quantitative methods of forecasting. We also review the needs and reasons for forecasting and what methods and approaches are employed for forecasting, requirements for forecasting, what are the shortcomings and business implications of forecasting.
STOCK MARKET PREDICTION USING MACHINE LEARNING METHODSIAEME Publication
Stock price forecasting is a popular and important topic in financial and academic
studies. Share market is an volatile place for predicting since there are no significant
rules to estimate or predict the price of a share in the share market. Many methods
like technical analysis, fundamental analysis, time series analysis and statistical
analysis etc. are used to predict the price in tie share market but none of these
methods are proved as a consistently acceptable prediction tool. In this paper, we
implemented a Random Forest approach to predict stock market prices. Random
Forests are very effectively implemented in forecasting stock prices, returns, and stock
modeling. We outline the design of the Random Forest with its salient features and
customizable parameters. We focus on a certain group of parameters with a relatively
significant impact on the share price of a company. With the help of sentiment
analysis, we found the polarity score of the new article and that helped in forecasting
accurate result. Although share market can never be predicted with hundred per-cent
accuracy due to its vague domain, this paper aims at proving the efficiency of Random
forest for forecasting the stock prices
Forecasting lessons from FMCG aisles by Thinus Hermann at the 37th Annual SAPICS conference and exhibition, held at Sun City, South Africa on 1 June 2015.
In this paper we attempt to review the models, process, qualitative and quantitative methods of forecasting. We also review the needs and reasons for forecasting and what methods and approaches are employed for forecasting, requirements for forecasting, what are the shortcomings and business implications of forecasting.
STOCK MARKET PREDICTION USING MACHINE LEARNING METHODSIAEME Publication
Stock price forecasting is a popular and important topic in financial and academic
studies. Share market is an volatile place for predicting since there are no significant
rules to estimate or predict the price of a share in the share market. Many methods
like technical analysis, fundamental analysis, time series analysis and statistical
analysis etc. are used to predict the price in tie share market but none of these
methods are proved as a consistently acceptable prediction tool. In this paper, we
implemented a Random Forest approach to predict stock market prices. Random
Forests are very effectively implemented in forecasting stock prices, returns, and stock
modeling. We outline the design of the Random Forest with its salient features and
customizable parameters. We focus on a certain group of parameters with a relatively
significant impact on the share price of a company. With the help of sentiment
analysis, we found the polarity score of the new article and that helped in forecasting
accurate result. Although share market can never be predicted with hundred per-cent
accuracy due to its vague domain, this paper aims at proving the efficiency of Random
forest for forecasting the stock prices
Forecasting lessons from FMCG aisles by Thinus Hermann at the 37th Annual SAPICS conference and exhibition, held at Sun City, South Africa on 1 June 2015.
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ForecastingDiscuss the different types of forecasts to include tim.pdfamolmahale23
Forecasting
Discuss the different types of forecasts to include time-series, causal, and qualitative models.
When might a researcher or project manager utilize exponential smoothing?
What benefit does a Delphi technique provide when working with qualitative-based decision
making?
Solution
Forecasting is basically the process of estimating or predicting the future trend, based on the
trend and information of the past and the present.Forecasting is a calculated assumption of how
the trend is going to be in a future date based on what we saw in the past and what we are
observing in the present scenario.
Time series methods:
These methods use historical data to assume future trends.
There are various time series methods such as,
1)Simple Moving Average Method: it is commonly used in technical analysis of financial data
such as stock prices,trading volumes or returns.Among the most popular technical indicators,
moving averages are used to gauge the direction of the current trend.It is calculated by averaging
a number of past data points. Once determined, the resulting average is then plotted onto a chart
in order to allow traders to look at smoothed data rather than focusing on the day-to-day price
fluctuations that are inherent in all financial markets.
As new values become available, the oldest data points must be dropped from the set and new
data points must come in to replace them. Thus, the data set is constantly \"moving\" to account
for new data as it becomes available. This method of calculation ensures that only the current
information is being accounted for.
for example, to calculate a basic 10-day moving average you would add up the closing prices
from the past 10 days and then divide the result by 10. The average thus obtained is plotted on a
chart. As the time progresses, we replace the first variable with the latest variable available ie.
latest closing price of 11th day, therefore getting a new avaerage. We plot this one too in the
chart. The chart thus formed gives a trend which is used for forecasting future movements.
2)Exponentially smoothed moving average:
Over the years, technicians have found two problems with the simple moving average. The first
problem lies in the time frame of the moving average (MA). Most technical analysts believe that
price action, the opening or closing stock price, is not enough on which to depend for properly
predicting buy or sell signals of the MA\'s crossover action. To solve this problem, analysts now
assign more weight to the most recent price data by using the exponentially smoothed moving
average (EMA).It is a type of infinite impulse response filter that applies weighting factors
which decrease exponentially. The weighting for each older datum decreases exponentially,
never reaching zero.
The exponentially smoothed moving average addresses both of the problems associated with the
simple moving average. First, the exponentially smoothed average assigns a greater weight to the
more recent data..
Demand forecasting is predicting future demand for the product. In other words, it refers to the prediction of a future demand for a product or a service on the basis of the past events and prevailing trends in the present.
Process of Forecasting, Techniques of forecasting,
- Prof. (Dr.) Sachin Paurush
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Demand forecasting
1. Demand forecasting
Introduction:
Demand forecasting is the activity of estimating the quantity of a product or service that consumers will
purchase. Demand forecasting involves techniques including both informal methods, such as educated guesses, and quantitative
methods, such as the use of historical sales data or current data from test markets.
Broadly speaking, there are two approaches to demand forecasting- one is to obtain information about the likely purchase
behavior of the buyer through collecting expert’s opinion or by conducting interviews with consumers, the other is to use
past experience as a guide through a set of statistical techniques. Both these methods rely on varying degrees of
judgment. The first method is usually found suitable for short-term forecasting, the latter for long-term forecasting. There
are specific techniques which fall under each of these broad methods.
Simple Survey Method:
For forecasting the demand for existing product, such survey methods are often employed. In this set of methods, we may
undertake the following exercise.
1) Experts Opinion Poll: In this method, the experts on the particular product whose demand is under study are
requested to give their ‘opinion’ or ‘feel’ about the product. These experts, dealing in the same or similar product, are
able to predict the likely sales of a given product in future periods under different conditions based on their experience. If
the number of such experts is large and their experience-based reactions are different, then an average-simple or
weighted –is found to lead to unique forecasts. Sometimes this method is also called the ‘hunch method’ but it replaces
analysis by opinions and it can thus turn out to be highly subjective in nature.
2) Reasoned Opinion-Delphi Technique: This is a variant of the opinion poll method. Here is an attempt to arrive at a
consensus in an uncertain area by questioning a group of experts repeatedly until the responses appear to converge along
a single line. The participants are supplied with responses to previous questions (including seasonings from others in the
group by a coordinator or a leader or operator of some sort). Such feedback may result in an expert revising his earlier
opinion. This may lead to a narrowing down of the divergent views (of the experts) expressed earlier. The Delphi
Techniques, followed by the Greeks earlier, thus generates “reasoned opinion” in place of “unstructured opinion”; but
this is still a poor proxy for market behavior of economic variables.
3) Consumers Survey- Complete Enumeration Method: Under this, the forecaster undertakes a complete survey of all
consumers whose demand he intends to forecast, Once this information is collected, the sales forecasts are obtained by
simply adding the probable demands of all consumers. The principle merit of this method is that the forecaster does not
introduce any bias or value judgment of his own. He simply records the data and aggregates. But it is a very tedious and
cumbersome process; it is not feasible where a large number of consumers are involved. Moreover if the data are
wrongly recorded, this method will be totally useless.
4) Consumer Survey-Sample Survey Method: Under this method, the forecaster selects a few consuming units out of
the relevant population and then collects data on their probable demands for the product during the forecast period. The
total demand of sample units is finally blown up to generate the total demand forecast. Compared to the former survey,
this method is less tedious and less costly, and subject to less data error; but the choice of sample is very critical. If the
sample is properly chosen, then it will yield dependable results; otherwise there may be sampling error. The sampling
error can decrease with every increase in sample size
5) End-user Method of Consumers Survey: Under this method, the sales of a product are projected through a survey of
its end-users. A product is used for final consumption or as an intermediate product in the production of other goods in
the domestic market, or it may be exported as well as imported. The demands for final consumption and exports net of
imports are estimated through some other forecasting method, and its demand for intermediate use is estimated through a
survey of its user industries.
Sreenath
2. Complex Statistical Methods:
We shall now move from simple to complex set of methods of demand forecasting. Such methods are taken usually from
statistics. As such, you may be quite familiar with some the statistical tools and techniques, as a part of quantitative
methods for business decisions.
(1) Time series analysis or trend method: Under this method, the time series data on the under forecast are used to fit a
trend line or curve either graphically or through statistical method of Least Squares. The trend line is worked out by
fitting a trend equation to time series data with the aid of an estimation method. The trend equation could take either a
linear or any kind of non-linear form. The trend method outlined above often yields a dependable forecast. The advantage
in this method is that it does not require the formal knowledge of economic theory and the market, it only needs the time
series data. The only limitation in this method is that it assumes that the past is repeated in future. Also, it is an
appropriate method for long-run forecasts, but inappropriate for short-run forecasts. Sometimes the time series analysis
may not reveal a significant trend of any kind. In that case, the moving average method or exponentially weighted
moving average method is used to smoothen the series.
(2) Barometric Techniques or Lead-Lag indicators method: This consists in discovering a set of series of some
variables which exhibit a close association in their movement over a period or time.
For example, it shows the movement of agricultural income (AY series) and the sale of tractors (ST series). The
movement of AY is similar to that of ST, but the movement in ST takes place after a year’s time lag compared to the
movement in AY. Thus if one knows the direction of the movement in agriculture income (AY), one can predict the
direction of movement of tractors’ sale (ST) for the next year. Thus agricultural income (AY) may be used as a barometer
(a leading indicator) to help the short-term forecast for the sale of tractors.
Generally, this barometric method has been used in some of the developed countries for predicting business cycles
situation. For this purpose, some countries construct what are known as ‘diffusion indices’ by combining the movement
of a number of leading series in the economy so that turning points in business activity could be discovered well in
advance. Some of the limitations of this method may be noted however. The leading indicator method does not tell you
anything about the magnitude of the change that can be expected in the lagging series, but only the direction of change.
Also, the lead period itself may change overtime. Through our estimation we may find out the best-fitted lag period on
the past data, but the same may not be true for the future. Finally, it may not be always possible to find out the leading,
lagging or coincident indicators of the variable for which a demand forecast is being attempted.
3) Correlation and Regression: These involve the use of econometric methods to determine the nature and degree of
association between/among a set of variables. Econometrics, you may recall, is the use of economic theory, statistical
analysis and mathematical functions to determine the relationship between a dependent variable (say, sales) and one or
more independent variables (like price, income, advertisement etc.). The relationship may be expressed in the form of a
demand function, as we have seen earlier. Such relationships, based on past data can be used for forecasting. The analysis
can be carried with varying degrees of complexity. Here we shall not get into the methods of finding out ‘correlation
coefficient’ or ‘regression equation’; you must have covered those statistical techniques as a part of quantitative methods.
Similarly, we shall not go into the question of economic theory. We shall concentrate simply on the use of these
econometric techniques in forecasting.
We are on the realm of multiple regression and multiple correlation. The form of the equation may be:
DX = a + b1 A + b2PX + b3Py
You know that the regression coefficients b1, b2, b3 and b4 are the components of relevant elasticity of demand. For
example, b1 is a component of price elasticity of demand. The reflect the direction as well as proportion of change in
demand for x as a result of a change in any of its explanatory variables. For example, b2< 0 suggest that DX and PX are
inversely related; b4 > 0 suggest that x and y are substitutes; b3 > 0 suggest that x is a normal commodity with commodity
with positive income-effect.
Sreenath
3. Given the estimated value of and bi, you may forecast the expected sales (DX), if you know the future values of
explanatory variables like own price (PX), related price (Py), income (B) and advertisement (A). Lastly, you may also
recall that the statistics R2 (Co-efficient of determination) gives the measure of goodness of fit. The closer it is to unity,
the better is the fit, and that way you get a more reliable forecast.
The principle advantage of this method is that it is prescriptive as well descriptive. That is, besides generating demand
forecast, it explains why the demand is what it is. In other words, this technique has got both explanatory and predictive
value. The regression method is neither mechanistic like the trend method nor subjective like the opinion poll method. In
this method of forecasting, you may use not only time-series data but also cross section data. The only precaution you
need to take is that data analysis should be based on the logic of economic theory.
(4) Simultaneous Equations Method: Here is a very sophisticated method of forecasting. It is also known as the
‘complete system approach’ or ‘econometric model building’. In your earlier units, we have made reference to such
econometric models. Presently we do not intend to get into the details of this method because it is a subject by itself.
Moreover, this method is normally used in macro-level forecasting for the economy as a whole; in this course, our focus
is limited to micro elements only. Of course, you, as corporate managers, should know the basic elements in such an
approach.
The method is indeed very complicated. However, in the days of computer, when package programmes are available, this
method can be used easily to derive meaningful forecasts. The principle advantage in this method is that the forecaster
needs to estimate the future values of only the exogenous variables unlike the regression method where he has to predict
the future values of all, endogenous and exogenous variables affecting the variable under forecast. The values of
exogenous variables are easier to predict than those of the endogenous variables. However, such econometric models
have limitations, similar to that of regression method.
Sreenath