Research Methods in Psychology For Dummies by Martin Dempster & Donncha Hanna

Author:Martin Dempster & Donncha Hanna
Language: eng
Format: epub, mobi
ISBN: 9781119035107
Publisher: Wiley
Published: 2015-10-14T00:00:00+00:00

Interpreting information about level

Level refers to an average of the scores on your outcome variables across all the data-collection points within a phase. Take Figure 9-2 as an example (refer to the earlier section, ‘Looking at interrupted time series design with a comparator’). Here you have two phases, with four data-collection points before you introduce the intervention and four data-collection points after. You can summarise these data-collection points by averaging the scores for each phase. Averaging means adding up all the scores and then dividing by the number of scores. So, in this case, you add up the scores in each phase (looking at the intervention and comparator separately) and divide this number by four. You can see the scores for this graph in Table 9-1.

Table 9-1 Averaging Scores from Figure 9-2 to Ascertain Level

Month

Intervention

Comparator

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