Database Functions & Filtering

Database Functions & Filtering

Excel has two special functions for analyzing lots of data with more than one set of criteria

DCOUNT: counts the number of times an event occurs meeting a criteria

DAVERAGE: finds the average of events meeting a criteria

Database Functions & Filtering

DCOUNTThis is the range of data to be counted. Must include column headings

Leave this blank

Specify the criteria to be counted. Need the same column headings as database

Database Functions & Filtering

Ex: (from text) Use Cars.xls file to determine how many Toyotas were repaired in Arizona. Open Cars.xls and copy the headings.

Paste the headings on an empty sheet.

Type the criteria you want to count.

Database Functions & Filtering

Sol:

Database Functions & Filtering

Sol (cont): To find how many Toyotas were repaired in Arizona, use DCOUNT

Enter range of data with headings

Leave Blank

Enter your search criteria. This will be the cells from the previous slide

Database Functions & Filtering

Sol (cont):

Database Functions & Filtering

Ex: Use Cars.xls file to determine how many Toyotas were repaired in Arizona or Utah.

Sol: Same directions as previous example. Exception: need two lines, one for

Arizona & one for Utah Both lines should contain Toyota

Database Functions & Filtering

Sol (cont):

Database Functions & Filtering

DAVERAGE:

still need correct column headings

will find the average of criteria you specify

Database Functions & Filtering Ex: Use Cars.xls file to determine the

average repair cost of Fords that were repaired in New Mexico.

Soln:

Same directions as previous example except use DAVERAGE.

Select the heading that you want to average and put in “Field.”

Database Functions & Filtering

Sol:Specify database including column headings

Type the name of the heading that you want to average in quotation marks

Enter search criteria according to the column headings you copied and pasted

Database Functions & Filtering

Sol (cont):

Database Functions & Filtering

Ex: Use Cars.xls file to determine the average repair cost of Chevrolets that were repaired in Utah at speeds that were at least 8 mph.

Sol:

Database Functions & Filtering

Finding probability using two DCOUNT functions

Ex: What percentage of Chevrolet’s were repaired in Arizona?

Database Functions & Filtering

Sol: First, find the number of Chevrolets.

Database Functions & Filtering

Sol (cont): Next, find the # of Chevrolet’s repaired in Arizona.

So, there were repaired in Arizona.

%43.327424

Database Functions & Filtering Filtering

Allows you to list all the items of data meeting a certain criteria

Use DCOUNT to get data

Click on any empty cell

Select Data/Filter/Advanced Filter

Database Functions & Filtering

Filtering

Click here

Specify range of data

Specify the criteria you want listed

Tell Excel where you want the data items to be displayed

Database Functions and Filtering

Focus on the Project: Variables:

Y: borrower with 7 years of experienceT: borrower with Bachelor’s DegreeC: borrower with loan during Normal

economy Use DCOUNT to find number of

records with Y, then T, then C

Database Functions and Filtering

Focus on the Project:

Number of Y records: 239

Number of successful Y records: 105

Number of failed Y records: 134

Database Functions and Filtering

Focus on the Project:

Number of T records: 1,154

Number of successful T records: 510

Number of failed T records: 644

Database Functions and Filtering

Focus on the Project:

Number of C records: 1,547

Number of successful C records: 807

Number of failed C records: 740