Data Services In Aurora IL At NW Database Services

Data Cleaning, Data Cleansing, Data Scrubbing, Deduplication, Data Transformation, NCOA, Mail PreSorts, Email Verification, Email Append, & Phone Append Services in Aurora Illinois

Get The Best Database Services In Aurora Illinois

We provide data services to businesses and organizations in Aurora IL and all Illinois cities. With over 3 decades of experience in the database business, you won’t find a company that can solve your specific database needs with higher quality service or better prices than Northwest Database Services. No matter what your specific need is, our team will find a data service solution to suit your situation.


More Cities and States Where We Offer Data Cleaning Services

We Are A Full Service Data Services That Can Help You Run Your Business

Northwest Database Services is a full-spectrum data service that has been performing data migration, data scrubbing, data cleaning, and de-duping data services for databases and mailing lists, for over 34 years. NW Database Services provides data services to all businesses, organizations, and agencies in Aurora IL and surrounding communities.

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What We Do

Database Services

When you need your data to speak to you regarding your business’s trends, buying patterns or just whether or not your customers are still living.

Data Transformation

We provide data transformation services for Extract, Transform and Load (ETL) operations typically used in data migration or restoration projects.

De-duplication Service

Duplication of data plagues every database and mailing list. Duplication is inevitable, constantly keeps growing and erodes the quality of your data.

Direct Mail - Presorts

It’s true the United States Postal Service throws away approximately thirty five percent of all bulk mail every year! Why so much? Think: “Mailing list cleanup.

Email-Phone Append

With access to more than 500 million email addresses, Northwest Database Services uses one of the most comprehensive and unique data sets in the industry.


Over 40 million Americans change their address annually, which makes us do the work to maintain a high-quality mailing list while you focus on your business.

We Are Here To Help!

2 + 1 =


Woodland, WA 98674


gch [@]
To use email, remove the brackets


Call Us

(360) 841-8168

Information About Data Cleaning And Data Services

What is Hypothesis Testing?

Hypothesis testing involves confirming that your samples support your hypothesis. This is done in order to eliminate any possibility of an accidental result. The clinical trials for the covid-19 vaccine are an example of this. To ensure that the vaccine can be tested on a large number of people, we conduct many trials using a limited number of random samples.

The hypothesis test could ask the following question: “Does covid-19 cause severe illness?” We can determine whether the vaccine works by comparing data from different populations. If the results of all samples are similar and the data is both representative and random, we can conclude that the vaccine will have the same effect on everyone. It is also important to investigate why certain samples are more effective than other. There are two possibilities: the vaccine was administered to different groups or the sampling process was flawed. One of the Covid vaccines was more effective than the others in the trial due to dosing errors. This is a good example of the importance hypothesis testing. If the outlier group were just discarded, the vaccine would be much less effective.

What is a Confidence Period?

Confidence intervals, which are based on samples, can be used for estimating parameters that are relevant to measuring a population (such as the mean). The confidence interval is not a single value, but rather a range. It is often expressed in percentages. A confidence interval is used to verify that the conclusions drawn from a sample are correct.

Let’s say you have 40 randomly selected cats and their tails were measured. The average length of tails measured is 17.5 cm. The average deviation in tail length is 2 cm. A special formula can be used to calculate the average lengths of tails for all cats. This results in a 95% confidence interval. This means that 95%, which is impossible to know without measuring all of population, falls within this range. This is a great way to test the accuracy of sampling methods.

What is Regression and Correlation Analysis?

Regression and correlation analysis are both options to determine the relationships between two or more variables.

Regression analysis analyzes how one dependent variable (or output), is affected by one or several independent variables (or inputs). This can be used to test hypotheses or for predictive analytics. You could use this data to predict future sunscreen sales (an input variable) by comparing sales from the previous year with weather data (which may be both input variables), in order determine how sunny days have affected sales.

Correlation analysis is a method of determining the degree to which two or more datasets are related. Contrary to regression analysis, correlation analysis doesn’t infer cause-and effect.

Northwest Database Services has 34+ years experience with all types of data services, including mail presorts, NCOA, and data deduplication. If your database systems are not returning poor data, it is definitely time for you to consult with a data services specialist. We have experience with large and small data sets. Often, data requires extensive manipulation to remove corrupt data and restore the database to proper functionality. Call us at (360)841-8168 for a consultation and get the process of data cleaning started as soon as possible.

NW Database Services
404 Insel Rd
Woodland WA 98674

City of Aurora IL Information

Aurora Illinois

Aurora is a suburb of Chicago, Illinois. It’s located in DuPage and Kane counties, Kendall, Kendall, Will, and Will counties. It is mainly located in DuPage, Kane and Kendall counties.


There was an Indian village on the Fox River, which existed before European settlers arrived. After the Black Hawk War in 1834, the McCarty brothers settled both banks of the river. However, they sold their land on each side to the Lake brothers who then opened a mill. The McCartys owned and operated a mill at the east end. Aurora was founded with the construction of a postoffice in 1837.


Aurora receives approximately 40 inches of precipitation annually. On July 14, 1936, Aurora reached a record temperature of 111 degrees F (44 degrees Celsius). On January 16, 2009, the record low was -31 degrees F (-35 degrees Celsius). Aurora’s July average high temperature is 83.5 degrees F (28.6 degrees Celsius), while its January average low is 12.6 degrees F (-10.8 degree Celsius).


It is second in Illinois in terms of population, behind Chicago. It is also the 144th largest city in the United States. At the 2010 census, the population was 197 899, while it was 180 542 at the 2020 census.


Aurora has been a major regional transport hub for many years. Aurora is the last stop on the Burlington Northern Santa Fe line, which allows rail service to Chicago. There is also a stop at Rt. 59 station on BNSF Line. This station is located on the border of Naperville. Each city has a parking area on their respective sides of the tracks. Eola Yard is a railroad yard that the BNSF Railroad maintains in Aurora.

Top Businesses

Aurora lies at the border of the Illinois Technology and Research Corridor. As does Chicago’s metropolitan area, the city has a long history of manufacturing. Past and present prominent manufacturers include Lyon Workspace Products and The Aurora Silverplate Manufacturing Company. Barber-Greene Company and the Chicago Corset Company. Stephens-Adamson Company, Caterpillar Inc. and Caterpillar Inc.. Chicago Burlington and Quincy Railroad, later known as Burlington Northern, was the most prominent industry and employer. It was headquartered in Aurora. CB&Q Roundhouse still stands. It was originally known as Walter Payton’s Roundhouse. In 2009, the Payton estate decided to end its involvement. The restaurant became America’s Historic Roundhouse. Two Brothers Roundhouse took over ownership in 2011.


Aurora IL Map