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Statistical Techniques:. KEY:. GO!. CAUTION !. STOP!. When to Use What. VARIABLE’S LEVEL OF MEASUREMENT. CH. TECHNIQUE. NOMINAL. ORDINAL. DICHOTOMY. RATIO. 2. Frequency Distribution. 2. Crosstabulation. Too many categories?. Mode. 3. Does not exist. Median. 3.

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Statistical Techniques:

KEY:

GO!

CAUTION!

STOP!

When to Use What

VARIABLE’S LEVEL OF MEASUREMENT

CH.

TECHNIQUE

NOMINAL

ORDINAL

DICHOTOMY

RATIO

2

Frequency Distribution

2

Crosstabulation

Too many categories?

Mode

3

Does not exist.

Median

3

Does not exist.

Does not exist.

Interpret as proportion.

Mean

3

3

Standard Deviation

Need a mean.

Need a mean.

Difficult to interpret.

3

Variance

Need a mean.

Need a mean.

Difficult to interpret.

Use standard deviation instead.

3

I.Q.V.

Too many categories?

Chi-Square Test

4

Need a mean.

Need a mean.

Use proportions C.I.

5

Confidence Interval

6

T-Test

Need a mean.

Need a mean.

Use chi-square test.

ANOVA

Need a mean.

Need a mean.

Use chi-square test.

6

Use reference group technique.

Possibly frowned upon.

Make sure variable coded 0&1.

7

Regression I.V.

Needs special technique.

Needs special technique.

Use logistic regression.

7

Regression D.V.

No need to use this here.

No need to use this here.

Reference Groups I.V.

9

Use dichotomy and ratio var.

Use dichotomy and ratio var.

12

Interactions I.V.

Turn D.V. into dichotomy?

Needs special technique.

No need to use this here.

13

Logistic Regression D.V.

Needs square of ratio variable.

Needs square of ratio variable.

Needs square of ratio variable.

Non-Linear I.V.

15


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