While all the numerous advanced tools and techniques are employed for data analysis such as data science, business intelligence, NLP, classical and quantum machine learning, deep learning, implementation of Artificial Intelligence, and IoT, one of the techniques frequently preferred for analyzing financial data is statistical Time Series Analysis.
We all must have heard that people are saying that the price of different objects has decreased or increased with time, these different objects could be anything like petrol, diesel, gold, silver, eatable things, etc.
Also, the rate of interest fluctuates in banks and different for different kinds of loans. What are all this data, how it is useful? These types of data are time-series data that go through analysis for forecasts. (Explore more in particulars of financial analysis)
Because of the tremendous variety of conditions, time-series used by both nature and human beings for communication, description, and data visualizations. Also, time is the physical quantity, and elements, coefficients, parameters, and characteristics of time-series data are mathematical quantities, so time-series can have real-time or real-world interpretations.
In this blog, we are going to examine what is time series analysis, its scope in the future, how this can be used in several repetitions of financial data and services, and time series analysis using machine learning.
In the broad form, it is analyzed to obtain inference what has occurred in the past with the data point series and endeavour to predict what is going to appear in the coming time.
Now the questions arise "how do people get to know that the price of an object as increased or decreased over time", they do so by comparing the price of an object over a set of the time period.
An ordered set of observations with respect to time periods is a time series. In simple words, a sequential organization of data accordingly to their time of occurrence is termed as time series.
Time-Series Analysis through various mode of data visualization
Time acts as a reference point in relation to the entire procedure. It can be noticed that time-series always depicts a relationship between two variables in which one is time and the other one is any quantitative variable.
Not necessarily there is an increment in the change of variable with respect to time in the observations, it also exhibited decrement in variable-time observational data. For example, the temperature of a particular area at a particular time increases or decreases accordingly.
A time-series contains sequential data points mapped at a certain successive time duration, it incorporates the methods that attempt to surmise a time series in terms of understanding either the underlying concept of the data points in the time series or suggesting or making predictions.
Forecasting data using time-series analysis comprises the use of some significant model to forecast future conclusions on the basis of known past outcomes. An example of a restaurant in which prediction is made on the number of customers as when will more customers appear in the restaurant at a specified time duration based on the previous appearance of customers with time.
Broadly specified time-series models are Autoregressive (AR), Integrated (I), Moving Average(MA), and some other models are the combination of these models such as Autoregressive Moving Average (ARMA), and Autoregressive Integrated Moving Average (ARIMA) models. These models reflect measurements near concurrently in time will be more closely relevant as compared to measurements distant apart.
Consider an example In the financial domain, the main objective is to recognize trends, seasonal behaviour, and correlation through the usage of time series analysis technique and producing filters based on the forecasts, this includes;
To predict expected utilities- For the perfect and successively trading, it is necessary to have accurate and reliable future predictions such as asset prices, variation in usage, products in demand in statistical form through market research, and time-series dataset.
Simulate series- After getting statistical output data of financial time series, that can be used for creating simulations of future events. It helps us to determine the count of trades, expected trading costs and returns, required financial and technical investment, several risks in trading, etc.
Presume relationship- Recognition of the relationship between the time series and other quantities gives us trading signs to improve the existing fashion of trading. For example, to know the spreading of foreign exchange pair and its variation with a proposal, estimated trades can be inferred for a certain period for forecasting a widespread to reduce transaction costs.
Moreover, consider the simple example of a train steadiness, it includes the Time Series Data model that can be implemented to represent information such as stopping trains. It can be used;
To aggregate over time which train is late at which location, and
How many passengers were there on the train?
Furthermore, in order to examine social media hashtags and how frequently a hashtag is utilized in a specified interval of time. More and more, how many responses this particular hashtag used during such an interval. (Source)
It is a well-known fact that Machine Learning is a powerful technique in imagining, speech and natural language processing for a huge explicated dataset available, on the other hand, problems based on time series do not have usually interpreted datasets, even as data is collected from various sources so exhibit substantial variations in terms of features, properties, attributes, temporal scales, and dimensionality.
Time series analysis requires such sorting algorithms that can allow it to learn time-dependent patterns across multiples models different from images and speech. Various machine learning tools such as classification, clustering, forecasting, and anomaly detection depend upon real-world business applications.
Among various defined applications, discussing here Time series forecasting, it is an important area of machine learning because there are multiple problems involving time components for making predictions. There are multiple models and methods used as approaches for time series forecasting, let’s understand them more clearly;
Consider the same example, predicting the temperature of a city for the coming week, the only difference would come here now temperature will consider impacting factors such as rainfall and time duration of raining, humidity, wind speed, precipitation, atmospheric pressure, etc, and then the temperature of the city will be predicted accordingly. All these factors are related to temperature and impact it vigorously.
(Related blog: Big data analytics in Weather Forecasting)
Time-Series Forecasting: Methods and Models in Machine Learning
Combinedly “ARIMA” tries to fit the data into the model, and also ARIMA depends on the accuracy over a broad width of time series.
We can use Time Series for multiple investigations to predict future as circadian rhythms, seasonal behaviours, trends, changes, etc. to interrogate the questions like predicted values, what is leading and lagging behind, connections and association, control, repetitions, and hidden pattern, etc.
Time series analysis is basically the recording of data at a regular interval of time, which could lead to taking a versed decision, crucial for trade and so have multiple applications such as Stock Market and Trends Analysis, Financial Analysis and forecasting, Inventory analysis, Census Analysis, Yield prediction, Sales forecasting, etc.
Multiple applications of the Time-Series Analysis
We have discussed so far about time series analysis and its model, its role in finance, and the impact of machine learning on time series along with applications.
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