Data Services In Northern California At NW Database Services

We Provide Data Services Including Data Cleaning In All Northern California Cities

Get The Best Data Cleaning And Database Services

We provide data services, including data cleaning, to businesses and organizations in all state of Northern California cities. With over 34 years of experience in the database business and data services industry, Northwest Database Services can solve your specific database needs with top-quality service and affordable prices. Contact us at (360)841-8168 so we can discuss your data services project and then plan a data project that will meet or exceed
your requirements.

Northern California Cities We Serve Include:

Do You Offer Services In All Northern California Cities?

Yes, we do offer our data services  and data cleaning, data cleansing, and data scrubbing in all Northern California cities including Elk Grove, Salinas, Hayward, Sunnyvale, Roseville, Visalia, Santa Clara, Vallejo, Concord, Berkeley, Clovis, Fairfield, Richmond, Antioch, San Mateo plus all other N. California communities.

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 the state of Northern California
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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!

5 + 4 =


Sandersville, GA 31082


gch [@]
To use email, remove the brackets


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Information About Data Cleaning

What Is the Best Time to Remove Outliers

Data Cleaning Will Eliminate Outliers

Removing outliers is part of data cleaning, data scrubbing, and data cleansing from NW Database ServicesWhile it may seem normal to want to eliminate outliers during data cleaning, this is not always the best practice. In reality, it is sometimes best to keep outliers in your data.

If you remove outliers purely because they are located in extremes of your data, it could lead to inconsistencies that can be detrimental to your goals as an analyst. These inconsistencies can lead to a reduction in statistical significance in an analyze.

What Does Statistical Significance Mean?

An Overview of Hypothesis Testing and Statistical Significance (P Value)

You are trying to draw conclusions from the data you have collected and analyzed. If you want to know the eating habits of New York City residents, you will gather data from a small sample (say 1000). You want to see if the findings can be applied to a larger population or if they are just a result of chance (or another influencing factor) when you analyze these data. This is done by determining the statistical significance of your findings.

What Is The Process For Hypothesis Testing?

Hypothesis testing is a process that allows you to test two hypotheses at once: the null hypothesis or the alternate hypothesis. You will accept or reject one hypothesis based on your findings. The null hypothesis says that there is no statistical significance in the variables you are looking at. The alternative hypothesis is the opposite.

Let’s look at an example. Consider the relationship between self-esteem and coffee consumption. This is a score from 100. These are the variables you want to analyze: self-esteem, coffee consumption. You will see a correlation or relationship between coffee consumption and self-esteem when you analyze your data. A higher self-esteem score is associated with higher coffee consumption. This is a coincidence? Are people who consume more coffee likely to have higher self-esteem or are they just being a fluke?

You will need to establish if there is a statistical relationship between the variables in order to evaluate the strength and validity of your findings. Depending on what data you have, there are many ways to determine statistical significance. We won’t get into too much detail, but you will need to run the appropriate significance tests to determine the p-value.

The p value is a measure for probability. It tells how likely it is that your results were not due to chance. A p-value less than 0.05 indicates strong evidence against null hypothesis. This means that there is less than a 5 percent chance that the results were accidental. Your findings may be considered statistically significant in this instance. Your findings will be deemed statistically significant if your statistical significance test returns a p-value of greater than 0.05 These results may be accidental.

Data cleaning involves several procedures and removing outliers is part of the overall data cleaning process.

Material for this article originally appeared on Career Foundry.

Data Services From NW Database Services

Our data services that include data cleaning, data cleansing, and data scrubbing, data deduplication, are all based on the database normalization concept from Edgar Cobb. We have the experience and skills to properly complete your data repair project, getting rid of corrupt data. Contact us at (360)841-8168 for a complimentary consultation so we can determine what data services you require.

NW Database Services
404 Insel Rd
Woodland WA 98674

About Northern California

Northern California Information

Find Out About Northern California

Golden Bridge Gate in Northern CaliforniaNorthern California, also known as NorCal, is a semi-autonomous free state within the US. It is located in northern California, bordering Southern California to the south. It comprises of 48 counties in the Northern California region. It is home to a vast coastline, soaring peaks, picturesque landscapes, and incredible natural parks. Compared to their southern neighbors, who are more laidback, Northern California is more urban and self-conscious. The many perks that draw people to Northern California are the good baseline in terms of a growing economy, employment opportunities, education, and recreational facilities.


When Juan Rodriquez Cabrillo, a Spanish navigator, became the first European to explore the region that is currently California in 1542 when Native Americans inhabited it. There was pressure for settlement from missionaries who wished to convert Native Americans to Christianity which continued for the next few centuries. The start of the 19th century saw Spain colonizing the northern California region. It was in the 1830s when American troopers entered northern California and started to settle in the region. After the Mexican-American War ended in 1848, Northern California was ceded to the US and became the 31st state in 1850. the gold rush in Northern California from 1848 to 1855 was a major turning point for the region. People started arriving in the area by boat, leading to many becoming farmers and storekeepers. Even after the gold rush ended, more people continued to migrate to Northern California. After the First Transcontinental Railroad was laid in 1869, traveling west became easier. California became a major agricultural state and was known for growing crops such as tomatoes, grapes, almonds, and apricots.

Major Cities & Towns

The largest metropolitan area in Northern California is the San Francisco Bay Area which includes San Francisco, Alameda, Marin, Napa, Contra Costa, San Mateo, Solano, Santa Clara, and Sonoma counties. Some of the major cities in the Bay Area region are San Francisco, San Jose, and Oakland, along with their suburbs. A number of inland cities are also parts of Northern California, such as Fresno, Visalia, Yuba City, Eureka, and Redding.


Northern California has a moderate oceanic climate and receives higher rainfall than Southern California. The areas further away from the ocean have more of a Continental climate with hot and arid summers and cold winters. The temperature in the region ranges from the 90s to 50s in the summers and 50s to 30s in the winters. The mountains in the region remain covered with snow from mid-January through February. Fogs are quite frequent in the west and the coast, especially during the summer months, helping bring down the summer temperatures.


The population of Northern California has been steadily increasing over the years. The largest growth came during the Gold Rush era in the 1940s when a lot of post-War veterans and their families made it their base due to the extending industrial base. The next population increase was in the 1980s, attracted by job opportunities due to the expansion in Silicon Valley. Northern California has been increasing at a much faster rate than Southern California.


Northern California has a diversified economy and is one of the strongest economies in the world. It boasts a large number of companies in the technology and information-related sectors of software, biotechnology, medical instrument and devices, semiconductor, biomedical, clean power, and finances. It is home to Silicon Valley, a tech haven that is home to top tech companies, including Apple, Google, Hewlett Packard, Alphabet, Netflix, Adobe, eBay, PayPal, Zoom, Meta, LinkedIn, and others. Other significant industries in the region include agriculture, manufacturing, shipping, and tourism.

Material for information about Oregon first appeared in Wikipedia


Northern California Map