Browsing by Author "Keleş, Taliha"

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Comparison of classical linear regression and orthogonal regression with respect to the sum of squared perpendicular distances
(Assoc Measurement & Evaluation Education & Psychology, 2016-12-01) Keleş, Taliha; Altun, Murat; ALTUN, MURAT; Bursa Uludağ Üniversitesi/Eğitim Fakültesi.
Regression analysis is a statistical technique for investigating and modeling the relationship between variables. The purpose of this study was the trivial presentation of the equation for orthogonal regression (OR) and the comparison of classical linear regression (CLR) and OR techniques with respect to the sum of squared perpendicular distances. For that purpose, the analyses were shown by an example. It was found that the sum of squared perpendicular distances of OR is smaller. Thus, it was seen that OR line has appeared to present a much better fit for the data than CLR line. Depending on those results, the OR is thought to be a regression technique to obtain more accurate results than CLR at simple linear regression studies.
Gifted eighth, ninth, tenth and eleventh graders' strategic flexibility in non-routine problem solving
(Taylor, 2021-06-04) Keleş, Taliha; Yazgan, Yeliz; YAZGAN, YELİZ; Bursa Uludağ Üniversitesi/Eğitim Fakültesi/İlköğretim Bölümü; EHP-0027-2022
This descriptive survey study aimed to examine gifted students' success and strategic flexibility in non-routine problem solving. The study group consisted of 50 gifted students. A test consisting of seven problems was used to collect data. Answers were assessed in terms of correctness and strategy use. Flexibility was evaluated based on the use of appropriate strategies, intra-task flexibility, and inter-task flexibility. Descriptive statistics, Pearson's correlation coefficient and one-way ANOVA were used for analysis of the data. Students displayed an above-average performance in solving problems and strategy use. Students' intra-task flexibility was low, whereas their inter-task flexibility was high. There was a high correlation between flexibility and success. While success differed according to grade level, there was no significant difference between grades in terms of flexibility. Results are discussed in terms of their implications related to education, and recommendations aimed at mathematics education environments and curricula are made.