excel’ing at : june 19, 2003 ruth sanderson, epidemiologist

EXCEL’ing at :

June 19, 2003 Ruth Sanderson, Epidemiologist

OverviewWhy Innovate?

RRFSS analysis requirements and analysis tools

Overview of AutoCiOutput, Description

Demonstration of AutoCITricks

Conclusions

Why Innovate?

Needed faster way to comply with Analysis Guidelines:

• Denominator cell size<30 not to be released• Numerator cell size<5 not to be released• Coefficient of Variation >33.3 not to be

released (16.6-33.3 interpret with caution)• Estimates include 95% confidence intervals

Why Innovate?

Wanted:

Excel graphs with error bars that can be pasted into a Word document for a clean report

Walking Trail Use and Knowledge in past Year by Residence, Middlesex-London Health Unit, 2001-2002

0

10

20

30

40

50

60

70

80

Pe

rce

nt

(%)

Middlesex County 40.6 35.2 24.2

London 58.9 25.7 15.4

Used Know and Not Used Do Not Know

Source: RRFSS , Waves 5-20

Current Analysis Tools

• SPSS Syntax files or crosstab to get unweighted/ weighted estimates– Does not provide CV, CI or flag small cells

• Confidence Interval Syntax File from P. Holowaty, 1999– Requires transcription of numbers- prone to

human error & labour intensive

AutoCI - Output Overview

Outputs: 3 Components in Excel Spreadsheet:• Unweighted Table• Weighted Table

– Includes CI, CV and Warnings in Colour

• Excel Bar Graph with Error Bars – Basis for customized Graphs

AutoCI Overview- OutputUNWEIGHTED VALUES WEIGHTED VALUES

household income40 Total household income40< $40,00040 to < 70,00070 to < 100,000$100,000+ < $40,00040 to < 70,00070 to < 100,000$100,000+

Count 61 42 19 23 145 Yes Count 52 44 22 27% within household income4075.3 85.7 95 92 82.9 % within household income4076.5 88 95.7 93.1

+-95% C.I. 10.1 9 8.3 9.2C.V. 6.7 5.2 4.4 5.1

Count 20 7 1 2 30 No Count 16 6 1 2% within household income4024.7 14.3 5 8 17.1 % within household income4023.5 12 4.3 6.9

+-95% C.I. 10.1 9 8.3 9.2C.V. 21.9 38.3 98.4 68.2

Count 81 49 20 25 175 Total Count 68 50 23 29% within household income40100 100 100 100 100 % within household income40100 100 100 100

Many restaurants have been given an "Award of Excellence", a special designation for exceptional food safety & food handling, .... Are you aware of any restaurants in your community that have been given this award? * household income40 CrosstabulationMany restaurants have been given an "Award of Excellence", a special designation for exceptional food safety & food handling, .... Are you aware of any restaurants in your community that have been given this award? * household income40 Crosstabulation household income40 Total household income40

< $40,000 40 to < 70,00070 to < 100,000$100,000+ < $40,000 40 to < 70,00070 to < 100,000$100,000+

[London o

[London only] In the past year, have you eaten at OR ordered take-out food from

arestaurant, icluding family style restaurants as well as cafeteria style and fast

food restaurants?

0

20

40

60

80

100

120

%P

erc

en

t

Yes

No

Yes 76.5 88 95.7 93.1

No 23.5 12 4.3 6.9

< $40,000 40 to < 70,000 70 to < 100,000 $100,000+

Many restaurants have been given an "Award of Excellence", a special designation for exceptional food safety & food handling, .... Are you aware of any restaurants

in your community that have been given this award?

0

50

100

150

Yes

No

don't know

Yes 13.4 18 8.7 17.2

No 83.6 82 91.3 75.9

don't know 3 0 0 6.9

< $40,00040 to < 70,000

70 to < 100,000

$100,000+

AutoCI Output WarningsWEIGHTED VALUES

household income40 Total< $40,00040 to < 70,00070 to < 100,000$100,000+

Yes Count 52 44 22 27 145% within household income4076.5 88 95.7 93.1 85.3+-95% C.I. 10.1 9 8.3 9.2 5.3C.V. 6.7 5.2 4.4 5.1 3.2

No Count 16 6 1 2 25% within household income4023.5 12 4.3 6.9 14.7+-95% C.I. 10.1 9 8.3 9.2 5.3C.V. 21.9 38.3 98.4 68.2 18.5

Total Count 68 50 23 29 170% within household income40100 100 100 100 100

Many restaurants have been given an "Award of Excellence", a special designation for exceptional food safety & food handling, .... Are you aware of any restaurants in your community that have been given this award? * household income40 Crosstabulation household income40 Total

$100,000+ < $40,000 40 to < 70,000 70 to < 100,000 $100,000+Many restaurants have been given an "Award of Excellence", a special designation for exceptional food safety & food handling, .... Are you aware of any restaurants in your community that have been given this award?Yes Count 9 9 2 5 25

% within household income40 13.4 18 8.7 17.2 14.8+-95% C.I. 8.2 10.6 11.5 13.7 5.4C.V. 31.1 30.2 67.5 40.7 18.5

No Count 56 41 21 22 140% within household income40 83.6 82 91.3 75.9 82.8+-95% C.I. 8.9 10.6 11.5 15.6 5.7

[London only] In the past year, have you eaten at

OR ordered take-out food from arestaurant,

icluding family style restaurants as well as cafeteria style and fast

food restaurants?

Many restaurants have been given an "Award of Excellence", a special designation for exceptional food safety & food handling, .... Are you aware of any restaurants in your community that have been given this award?

0

50

100

150

%P

erc

en

t

Yes

No

don't know

Yes 13.4 18 8.7 17.2

No 83.6 82 91.3 75.9

don't know 3 0 0 6.9

< $40,000 40 to < 70,000 70 to < 100,000 $100,000+

Linked back to unweighted table

Output Graph & Error Bars[London only] In the past year, have you eaten at OR ordered take-out food from arestaurant,

icluding family style restaurants as well as cafeteria style and fast food restaurants?

0

20

40

60

80

100

120

YesNo

Yes 76.5 88 95.7 93.1

No 23.5 12 4.3 6.9

< $40,000 40 to < 70,000 70 to < 100,000 $100,000+

Auto CI- How does it Work?

• Run SPSS Syntax File calls on a script file• Script File:

– instructs SPSS to copy and past the unweighted and weighted output tables into Excel

– instructs macro in Excel to run and return to SPSS

• Excel macro calculates CI’s, CV’s, inserts warning colours & creates graph/ error bars

Auto CI- What do you need to make it Work?

• Software: SPSS, Excel• SPSS file title: test.sps• Excel file titled: autoci.xls• Files by B. Lueske, MLHU

• must have already established/created variable of interest & proper weight variable

Demo

Conclusions• AutoCi builds on and is dependent on the work of

other RRFSS partners– syntax files, CI calculator, weighting calculations,

analysis requirements

• AutoCI automates analysis requirements– calculating CV’s, CI, small cell count identification

• AutoCi provides quick visual of differences in estimates– Excel bar graph with error bars that can be modified or

pasted into Word documents