The intention of this research was to find the connections between three ways of measuring Clark's angles of footprints and finding its usability.
186 students from the first to the ninth grade of primary school Pirniče were involved in this research and before we began we got their parents consent.
The measurement took place in June 2010.
We used three different ways to get Clark's angle of the right and left foot:
• Manual measurement with astrolabe,
• With the help of computer programs Cabri 2 plus and
• Foot Study.
For the measurement of Clark's angles with both computer programs, we had to scan all the footprints with a scanner, so we could insert the photos into the program.
The obtained data were inserted into the Excel and processed with the statistic program SPSS. We calculated the descriptive statistics and the connection between all of three methods with Pearson's correlation coefficient.
We found out that:
• there are differences between these three methods of measurement of Clark's angles,
• not all of these methods enabled us to process all the footprints,
• there are considerable differences in time spent to process data with each way of measurement.
We also found out that in the first triad od primary school the fastest and the most usable way is the manual measurement with astrolabe and it also has the highest connection with the other two computer measurements.
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