Much of the discussion in traditional media, on social media and elsewhere regarding our recently published opinion poll findings on Tanzanian politics has focussed on perceived errors in the brief. We want to correct three of the most common misunderstandings.
1. “Totals do not add up to 100%.”
2. “Totals for 2013 and 2014 add up to much less than 100%.”
3. “A sample size of just 1,848 respondents is not sufficient.”
It has been pointed out that several charts and tables in the brief include data that does not seem to add up to 100%. In some cases, the figures add up to 99%, 101% or 102%.
This is purely as a result of rounding the figures to the nearest whole number, a standard practice in opinion poll research. We do this because presenting figures with one or even two decimal points suggests a level of precision in the findings that can be misleading.
The examples below show how this happens, by presenting the unrounded figures alongside the rounded figures that were presented in the brief.
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