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Great Learning Academy provides this Autocorrelation course for free online. The course is self-paced and helps you understand various topics that fall under the subject with solved problems and demonstrated examples. The course is carefully designed, keeping in mind to cater to both beginners and professionals, and is delivered by subject experts. Great Learning is a global ed-tech platform dedicated to developing competent professionals. Great Learning Academy is an initiative by Great Learning that offers in-demand free online courses to help people advance in their jobs. More than 5 million learners from 140 countries have benefited from Great Learning Academy's free online courses with certificates. It is a one-stop place for all of a learner's goals.

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Correlation estimates the strength of the relationship between two variables, and Autocorrelation measures the strength of the connection between a variable and itself at different points in time. Learn Autocorrelation in detail through Great Learning's free Autocorrelation course and gain a free course completion certification.

Autocorrelation is the degree of similarity between values in a time series and values from the same time series at a previous point in time. It is a measure of how well a time series can be predicted from its past. The causes of Autocorrelation are many and varied. Some common causes are: 

• Serial correlation 
• Common factors 
• Lagged variables

Autocorrelation is a problem because it can lead to spurious results. For example, if you are looking at the relationship between two variables, and one of the variables is autocorrelated, then the analysis results may be artificially inflated.

Autocorrelation is when a regression model cannot correctly predict the value of a variable because the model is using the wrong data. This can happen when the data is autocorrelated, meaning that the variable's value is correlated with the variable value at another time.

No autocorrelation means that the values in a data set are not correlated with each other, and it means that the correlation between a variable and itself is zero.

Autocorrelation is crucial because it allows us to measure the degree of similarity between a given time series and itself at different lags. This measure can be used to determine the presence of seasonality in the time series and detect other types of patterns.