Funnel plot Flashcards

1
Q

What are Funnel plots used for?

A

to demonstrate the existence of publication bias in meta-analyses.

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2
Q

Describe how funnel plots are usually drawn i.e. what is found on each axis?

A

treatment effects on the horizontal axis
study size on the vertical axis.

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3
Q

If a funnel plot shows a symmetrical, inverted funnel shape, does this indicate a publication bias is likely or unlikely?

A

Unlikely

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4
Q

What does an asymmetrical funnel plot indicate?

A
  • relationship between treatment effect and study size
    => indicates either publication bias OR
    a systematic difference between smaller and larger studies (‘small study effects’)
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5
Q
A
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