A mixed model ANOVA was conducted using the
pressure factor variable created through the principal
components factor analysis. The ANOVA model used
was based on the RLS experimental design and the
factorial treatment structure, and was created using the
protocol for RLS ANOVA and factorial treatment
structures in block-based designs as set forth by Lenter
and Bishop (1993). Gender defined the two squares,
participants (included as a random factor) were nested
within gender while both the chair factor (also random)
and the factorial treatment structure were crossed with the
square effect since the same chairs and treatments were
used for both squares. Table 3 presents the RLS ANOVA
model generated, as well as the results of the analysis. The
Satterthwaite (1946) method was used for testing of
random effects in the mixed model design.
The RLS ANOVA allowed for testing of the gender
factor to determine if there were gender-based interactions
with either the treatment structure or the chair factor.
Results indicated that significant interaction existed between
the square effect (gender) and both chairs and
treatments, thus additional independent Latin square
analyses were done for each gender, also presented in
Table 3. Results of the independent gender assessments
indicated significant differences within the male square for
all effects except the armrestangle interaction term.
Results for the female square were similar, with an
additional lack of significance for the armrest effect.
The use of a mixed model ANOVA also allowed for a
variance component analysis of the portions of random
variance associated with each of the random factors and
the error term. The chair factor accounted for 44% of the
random variance, participant (nested within gender) for
25%, the gender by chair interaction term for 4%, while
the error term accounted for 28% of the random variance.
A mixed model ANOVA was conducted using thepressure factor variable created through the principalcomponents factor analysis. The ANOVA model usedwas based on the RLS experimental design and thefactorial treatment structure, and was created using theprotocol for RLS ANOVA and factorial treatmentstructures in block-based designs as set forth by Lenterand Bishop (1993). Gender defined the two squares,participants (included as a random factor) were nestedwithin gender while both the chair factor (also random)and the factorial treatment structure were crossed with thesquare effect since the same chairs and treatments wereused for both squares. Table 3 presents the RLS ANOVAmodel generated, as well as the results of the analysis. TheSatterthwaite (1946) method was used for testing ofrandom effects in the mixed model design.The RLS ANOVA allowed for testing of the genderfactor to determine if there were gender-based interactionswith either the treatment structure or the chair factor.Results indicated that significant interaction existed betweenthe square effect (gender) and both chairs andtreatments, thus additional independent Latin squareanalyses were done for each gender, also presented inTable 3. Results of the independent gender assessmentsindicated significant differences within the male square forall effects except the armrestangle interaction term.Results for the female square were similar, with anประการสำคัญสำหรับผลพนักแขนเพิ่มเติมใช้แบบผสมการวิเคราะห์ความแปรปรวนยังอนุญาตสำหรับการวิเคราะห์ผลต่างส่วนประกอบบางส่วนของสุ่มผลต่างที่เกี่ยวข้องกับแต่ละของการสุ่ม และคำผิดพลาด ตัวเก้าอี้คิดเป็น 44% ของการสุ่มแปรปรวน ร่วม (ซ้อนภายในเพศ)25% เพศตามเงื่อนไขโต้เก้าอี้ 4% ขณะที่คำความผิดพลาดบัญชี 28% ของตัวแปรสุ่ม
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