Data Trend Analysis by Assigning Polynomial Function For Given Data Set

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International Journal of Computer Engineering In Research Trends
Volume 3, Issue 4, April-2016, pp. 162-164 ISSN (O): 2349-7084
Data Trend Analysis by Assigning Polynomial
Function For Given Data Set
Dhaneesh T,
Student, Department of Computer Science, Christ University, Bangalore
ABSTRACT:-This paper aims at explaining the method of creating a polynomial equation out of the given data set which
can be used as a representation of the data itself and can be used to run aggregation against itself to find the results. This
approach uses least-squares technique to construct a model of data and fit to a polynomial. Differential calculus technique is
used on this equation to generate the aggregated results that represents the original data set.
Keywords - Curve Fitting, Trend Analysis in Data, Data Analytics
——————————  ——————————
1. INTRODUCTION
Data analytics (DA) could be defined as science of
examining raw data with the purpose of drawing
conclusions about the information contained within.
Applications of Data Analytics or Trend Analysis are:
 Useful in computing customer satisfaction
metrics for various products in the market.
 Used for identifying trends in the market over
a period of time specific to a region on the
globe
 To forecast stock market movement based on
earlier trends that are identified etc…
2. EXISTING MODELS
Existing models of Data Analysis requires a vast
storage space to accommodate the volume of data. This
works aptly for the enterprise which has focus over
variety of metrics and grows dynamically over a short
period of time. However for the organizations that has
a clear focus on predefined metrics from the data which
is their concern for analysis, it would not be feasible
for them to support the storage space
requirement which increases the cost.
3. FITTING DATA TO A POLYNOMIAL
EQUATION: THE APPROACH
Consider we take a data set and represent them in the
vector form of pair, where - the independent
variable and is the dependent variable. We assume
that the data that we would want to represent as an
equation fits into a polynomial of nth order. Hence the
problem for us to fit this data into the equation would
be to find the coefficients for every pair of ,
This is the general equation for unknowns. We
know that to find the unknowns, we need
equations and each one would arise from
an , (independent, dependent) pair. Thus now the
task would to solve this set of equations to find the
coefficients and represent the data.
Our assumption about the data to be fit is that each
data points that we derive from the given dataset is in
the format of independent and dependent pair .
For example, consider if we want to fit the data about
the yield that a farmer gets from a crop depending on
the amount of fertilizer that the farmer uses. This is a
slow growing metrics which we would want to store
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Dhaneesh T et al.,International Journal of Computer Engineering In Research Trends
Volume 3, Issue 4, April-2016, pp. 162-164
and run analytics over a large period of time. Here in
this example, the independent variable will be
fertilizer usage in tones and the crop yield in tones will
be the dependent variable. The graph for this example
would be as given below in the Fig 3.1:
Fig 3.1: Sample Data Fit to a Curve
Our initial task would be to generate the polynomial
equation for the dataset that represents the curve that is
shown in the above figure. Once we have the equation,
we can run differential equation on that to identify the
crop yield of the farmer corresponding to the amount
of the fertilizer that the farmer used. Decision about the
metrics selection still rests with the requirement and is
out of scope of this paper.
Once the metrics are chosen and the polynomial
equation are derived, then the same can be stored with
a minimum space requirement than storing the whole
dataset itself.
4. DIFFERENTIAL CALCULUS: FINDING
THE SLOPE AT A GIVEN POINT
Differential calculus, in practicality, is about describing
in a precise fashion the ways in which related
quantities change. This fundamentally lays down the
idea about comparison and analytics of data.
Given a function , the derivative of the function is
denoted as where is the rate of change of
the function with respect to the variable .
Example
Let’s take a scenario where a production facility, which
is capable of producing 60,000 artifacts a day, decides to
store and manage their production costs summary. We
look at two metrics here which are the number of
artifacts produced each day and the cost of production
for that day. Using the data fit method that is described
earlier; the cost versus number of artifacts produced is
mapped to the cost function as given below:
Instead of storing the entire dataset the facility decides
to store this cost function and run analytics over this.
Let’s try to find a business case where the task would be
find the number of artifacts that they should produce in
a day to minimize the production cost.
The criteria here would be to minimize the cost subject
to the fact that the value of the number of artifacts
that the facility can produce in a day, should be in the
range .
The first set of derivatives for the above cost function
would be:
Thus the critical points of the cost function is given by:
Solving the above equation we get the value of .
From the above value, it could be clearly stated that the
negative value for can be omitted. Thus this
concludes that the facility should produce 50,000
artifacts in a day to minimize the cost of production.
This value is purely based on the cost function that is
generated by a sample production detail. Thus
variation in the cost function would result in a different
value.
5. RESULTS AND DISCUSSIONS We have presented a general idea about how a
polynomial equation that is generated from the given

Dhaneesh T et al.,International Journal of Computer Engineering In Research Trends
Volume 3, Issue 4, April-2016, pp. 162-164
dataset would solve the problem of data analysis. Scilab
was used to demonstrate the method of data fit to a
curve using Least Squares Method to reduce the noise
factor while considering a vast data set. The sum of
the squares of the offset values are used instead of the
offset absolute values itself because this allows the
residuals to be treated as a continuous differentiable
quantity and thus reducing the noise. A sample curve
that was generated using the least squares method is
shown below in the Fig 5.1
Fig 5.1: Sample Curve generated using Least Squares
Method
6. CONCLUSION
Scilab tool was used to demonstrate the creation of
polynomial equation for the given data set.Future
enhancements for this idea will include usage of
Machine Learning algorithms to generate the
polynomial equations for the given data set. This will
help us in creating a model that can update the existing
equation due to merging of more data with the
archived data for the same metrics.
REFERENCES
[1] Haijun Chen, “A SPECIAL LEAST SQUARES
METHOD FOR CURVE FITTING”, Measurement and
Control Group, Dept. Electrical Engineering,
Eindhoven University of Technology, Postbus 513, 5600
MB Eindhoven, The Netherlands.
[2] Aimin Yang, “The Research on Parallel Least
Squares Curve Fitting Algorithm” College of Science
Hebei Polytechnic University Tangshan, Hebei
Province, 063009 China.
[3] Junyeong Yang and Hyeran Byun “Curve Fitting
Algorithm Using Iterative Error Minimization for
Sketch Beautification”, Dept. of Computer Science,
Yonsei University, Seoul, Korea, 120-749
[4] G. Taubin, “An improved algorithm for algebraic
curve and surface fitting”, Proc. Fourth 658-665, Berlin,
Germany.

Data Trend Analysis by Assigning Polynomial Function For Given Data Set

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Data Trend Analysis by Assigning Polynomial Function For Given Data Set