Tutorial: Crime & Violence Data Tutorial: Crime & Violence Data Cubes at NCOVR Data CenterCubes at NCOVR Data Center

Last Update: September 12, 2005 by: Jacqueline Cohen

Summary SlideSummary Slide(Click below to move to a section)(Click below to move to a section)

Access to NCOVR Data Cubes

Cube Resources Cube Elements Manipulate Rows & C

olumns Add/Delete Rows & C

olumns Charts Split View of Chart &

Table

Save/Export Results Save Cube Query User Designed Custo

m Queries Query Design – Indivi

dual Records Query Design – Summ

ary Data Save/Export Custom

Queries

NCOVR Web Access:NCOVR Web Access:http://www.ncovr.org/http://www.ncovr.org/

1.Access Data Center from NCOVR Web Site

2. Open Data Access Page

Data Access PageData Access Page

User Resources

New Users—Register for Free Personal Account

Data Access PageData Access Page

User Resources

Open Data List & Codebooks Description of Data Access Tools

Data Set Description Go to

Selected Data Cube

COGNOS Login WindowCOGNOS Login Window

Registered Users Receive Personal Directory to Save & Share Data Tables

Available Cube Resources Available Cube Resources

Help ResourcesHelp Resources(from “Data Cubes and Reports”)(from “Data Cubes and Reports”)

Codebooks On-Line Tutorials

Access Data CubesAccess Data Cubes (from “Data Cubes and Reports”)(from “Data Cubes and Reports”)

Current Collection of Public Access Data: NCVS, NIBRS, UCR, US Census

Search Cube ContentsSearch Cube ContentsSelect Search Tab and Enter Keywords

Search Results — Click to Open

Elements of Cube WindowElements of Cube Window

Toolbar

Dimension Bar

Dimension Viewer

Dimensions & MeasuresDimensions & MeasuresClick to view other dimensions in bar

Dimensions:Dimensions: AttributesAttributes that describe cases in data that describe cases in data (row & column heads; filter conditions)(row & column heads; filter conditions)Measures:Measures: Counts, Percents, Counts, Percents, otherother Quantities Quantities summarize cases ( displayed inside table cells)summarize cases ( displayed inside table cells)

Expand DimensionsExpand DimensionsClick Click ++ sign sign OROR Click Click >> arrow arrow

Manipulate Rows or Columns in TableManipulate Rows or Columns in Table

Right click on row bar (above row labels) to:

* Expand, delete, swap dimensions

* Substitute up or down levels in hierarchy

Row Bar

Filter Data Using Dimensions Filter Data Using Dimensions

Left click on item to filter data to desired attribute

Right click item, Right click item, then then select FilterFilter OR

After expand dimension to desired level:

Expand Table DimensionsExpand Table Dimensions

Right click in column bar

Click on Down a Level

Result: Expands Crime Types

Manipulate Rows or Columns Manipulate Rows or Columns in Dimension Viewerin Dimension Viewer

• Replace rows or columns dimension

• Filter data to selected dimension value

• Nest new dimension under current row or column dimension

• Find specific dimension value in rows or columns

Right click item in dimension viewer

Calculations & Hide/ShowCalculations & Hide/Show• Right click in row or column header box

• Left click to insert calculation or hide/show rows or columns

Calculate RatesCalculate Rates

• Select operator

• Name calculation

• Select dimensions

• Right click in column header box

• Click “Insert calculation”

Hide/Show DimensionsHide/Show Dimensions

• Right click in column header box

• Click “Hide/Show

• Select items to hide (show)

• Use arrows to move between hidden & visible

Swap Rows & ColumnsSwap Rows & Columns

Click to Swap Rows & Columns

Chart DataChart Data

Available Chart Styles

Chart Button on Toolbar

Chart Display OptionsChart Display Options

• Change axes scale

• Show grid lines

• Show markers

Options button on toolbar

Chart Display OptionsChart Display Options

• Fit chart to screen

Options Button on toolbar

Results: Chart Fit to 100% ScreenResults: Chart Fit to 100% Screen

Measure in Chart = Rate

Split View of Chart & TableSplit View of Chart & Table

1. Options Button2. Split View

Show Table Show Table

• Crosstab—Row-by-Column Table

OR

• Indented Rows Crosstab Format

Export Summary DataExport Summary Data

Export summary table to CSV file for use in other applications

Toolbar at bottom of cube window

Use Data CODES, Not LabelsUse Data CODES, Not Labels

1. OPTIONS icon in Toolbar at bottom of cube window

2.Open OPTIONS Menu from

CROSSTAB (Table) view > Select “Options”

3.

Click to turn ON “Short Names”

Save Query for Future UseSave Query for Future Use

• Registered users can save query

• Saves current table format and calculations for future use

• Automatically includes results from data updates

“Save As” Icon

Destination for Save QueriesDestination for Save QueriesUser supplies name and description

User supplies destination in personal “Newsbox”

Sharing Queries with Others:Sharing Queries with Others:Registered Users OnlyRegistered Users Only

Select Properties in user’s NewBox

Select Security Tab

Designate Users

Drill Through to Retrieve Drill Through to Retrieve Original Record DataOriginal Record Data

Toolbar at bottom of cube window

Drill through summary table to query underlying record data

Drill Through to Retrieve Drill Through to Retrieve Original Record DataOriginal Record Data

Drill-through returns original coded values of all variables

Drill-through toolbar at bottom of cube window

Web Access to CodebooksWeb Access to Codebooks

Web link opens codebook list

UCR Offenses

UCR Offenses Variable CodesUCR Offenses Variable CodesQuery data to include monthly reports only if agency in city with population > 100,000

Relevant Codes from Codebook:

Actual offenses: ID_Card = 1

●●●

City Population > 100,000: ID_Group < 2

Toolbar in Drill-Through WindowToolbar in Drill-Through Window

Create Create CrosstabCrosstab

Create Chart

Filter Data

Design Data

Export Data

Modify Columns in Design DataModify Columns in Design Datato Restrict Variablesto Restrict Variables

Design Button in

Drill-Through

Add Columns or Calculations

Delete columns

Add Calculation to QueryAdd Calculation to Query

HINT: Add calculations before add or delete columns

Click items to include in calculation

Add Columns to QueryAdd Columns to Query

Left click to add items to query

Left click to highlight;then X to delete items from query

Filter Records in Design DataFilter Records in Design Data

Select Filter to restrict contents of data

Select Filter variable

Create filter conditions

Active Filters

Click to Add Filter

Query Results: Monthly Records Each Query Results: Monthly Records Each Police Agency (ORI) with Pop Police Agency (ORI) with Pop >> 100K 100K

Data in List Format: Distinct monthly record for each unit of observation

Summarize Functions in Design DataSummarize Functions in Design Data

Count records

Sum values

Average values

Minimum value

Maximum value

Design Data Summarize

Add Columns in List or Crosstab FormatAdd Columns in List or Crosstab Format

Point & Click to select variables and destination

Query Results: Yearly Gun Crimes per Query Results: Yearly Gun Crimes per ORI with Population ORI with Population >> 100K 100K

Longitudinal data of annual measures for each unit of observation compiled from monthly data

Save and Export Query ResultsSave and Export Query Results

Save query design Export query records

Drill-Through Toolbar Toolbar