4. 4.4.3 Regression Analysis. In This Study, A Multiple

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4.4.3 Regression Analysis
In this study, a multiple regression analysis was applied to test the influence among predictor variables. The research used statistical package for social sciences (SPSS V 20) to code, enter and compute the measurements of the multiple regressions.

Table 11, Regression Analysis Model Summary
Model
R
R Square
Adjusted R Square
Std. Error of the Estimate
1
.789a
.623
.616
.48825
a. Predictors: (Constant), staff skill, documentation, funding, procurement procedure
Source: own spss computation, 2017
As shown to the results in the summarized Table 11 above, Coefficient of determination explains the extent to which changes in the dependent variable can be explained by the change in the independent
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Table 13, Coefficient of determination
Model
Unstandardized Coefficients
Standardized Coefficients
T
Sig.

B
Std. Error
Beta

1
(Constant)
-1.381
.239

-5.769
.000

Procurement procedure
.168
.075
.130
2.229
.027

Fund
.389
.060
.359
6.520
.000

Staff skill
.636
.106
.287
5.984
.000

Documentation
.304
.064
.255
4.738
.000
a. Dependent Variable: inventory
Source: own spss computation, 2017
According to the finding in the above table the regression equation was
Y = -1.381+ 0.168 X1 + 0.389 X2+ 0.636X3 + 0.304X4
Where Y is the dependent variable (effectiveness of inventory management), X1 is procurement procedure, X2 is Funding, X3 is the staff skill X4 is Documentation.
The strength of each predictor (independent) variable influence on the dependent variable can be investigated via standardized Beta coefficient. Hence, the regression coefficient explain the average amount of change in dependent variable that caused by a unit of change in the independent variable.
Therefore, as shown the table above fund is the most contributing factor in the prediction of effectiveness of inventory management in Este woreda public sector with beta value 0.359 followed by a staff skill with the beta value of 0.287. The other two predictors, in their descending order of standardized coefficients, documentation (B=0.255) and procurement procedure (B=0.130) that the
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