Hi,
I would like to calculate the standard error of my Dependent Variable. However, I have psycholinguistic data, which uses multiple ppts and multiple items. Thus, there are 2 ways of doing this: either by calculating SE over averaged responses (example 1) OR by calcualting SEs over raw responses (Example 2)
1. Average over items by participant (as in Table 1). Then calculate mean and SE from this table.
Table 1.
..which gives mean 62.67 and SE = 16.63
2. List each observation on its own row (as opposed to average observation by ppt)  as in Table 2.
Table 2:
Because N is greater in example 2, the SE will be different (Mean =62.67 ; SE =17.3 ). The example I give is very simple, but the fact you can get different SEs is important  especially if I were using SE to compare means in two different conditions. My question is, which method is best for calculating the Standard Error?
Many thanks! Altohugh this is a simple Q, I really appreciate any insights.
Ryan
I would like to calculate the standard error of my Dependent Variable. However, I have psycholinguistic data, which uses multiple ppts and multiple items. Thus, there are 2 ways of doing this: either by calculating SE over averaged responses (example 1) OR by calcualting SEs over raw responses (Example 2)
1. Average over items by participant (as in Table 1). Then calculate mean and SE from this table.
Table 1.
..which gives mean 62.67 and SE = 16.63
2. List each observation on its own row (as opposed to average observation by ppt)  as in Table 2.
Table 2:
Because N is greater in example 2, the SE will be different (Mean =62.67 ; SE =17.3 ). The example I give is very simple, but the fact you can get different SEs is important  especially if I were using SE to compare means in two different conditions. My question is, which method is best for calculating the Standard Error?
Many thanks! Altohugh this is a simple Q, I really appreciate any insights.
Ryan
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