Statistics help - correlations Watch

Matthewsharam
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Report Thread starter 3 years ago
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Hey there,
Dissertation tutor hasn't got back to me so i'm gonna give this a shot here.

For my dissertation's statistical analyses i am running a correlation study, looking at the relationship between some psychological questionnaires.

However I am struggling with which correlational test to run: Pearson r or Spearmans rank.

I have used Zkurt and Zskew to find out if the results are normally distributed and have found out that some are and some aren't!

My question is...
Do i use the Spearmans rank for all of the results or can use a combination of both, pearsons r for the normally distributed correlations and the spearmans rank for the others?

I have a feeling i will just have to use Spearmans rank but i don't want to as it only gives me one significant result rather than the three signifcant results the pearson r is giving me!

Thanks in advance
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Asklepios
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It's not good scientific practice to compute various tests and choose the most favourable one! You should always decide on the most appropriate beforehand to minimise bias.

The key difference here is that Spearmans is used for ordinal data e.g. Scale of happiness 1-5, where it is clear that 5 > 4 > 3 etc but that's it really. Pearsons is used for linear/interval data e.g. Kg or m


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Matthewsharam
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Thanks for your response.
Yeah its ordinal data but other studies have used pearson despite this, so i wasn't sure.
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