Exploring the effect of online shopping motivations on purchase intention applied



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MariaConstançaMorais 152115144 Msc Thesis

Number 
of items 
Cronbach’s 

 
Cronbach’s 

 
if items 
deleted 
Number of 
items 
deleted 
Final 
number 
of items 
Hedonic 
Motivations 
11 
0.909 


11 
Utilitarian 
Motivations 
18 
0.922 


18 
Online Purchase 
Intention 

0.948 



4.1.5 Principal Component Analysis 
Through SPSS 23.0 for Windows, thirty two items were analyzed. Firstly, the capability of 
our data for factor analysis was tested.
Principal component analysis was made to understand the ability of the indicators to properly 
measure the constructs previously presented. A principal component analysis with varimax 
rotation was performed with every dimension. All the dimensions were aggregated around the 
factor they were supposed to measure. The total variance explained is 63.61%. Concerning 
the sample size, Comrey and Lee (1992) defined a sample size of 100 elements as poor, 200 
as fair and from 300 as good. Sample sizes of 500 are considered to be very good and from 
1000 excellent. Hair et al. (2005) recommends a sample size above 200 with a minimum of 5 
respondents for each parameter, considering more appropriated 10 respondents for parameter. 
As our sample size is 286 our data is, according to the authors, adequate for factor analysis.
The Kaiser-Meyer-Olkin Measure of Sampling Adequacy (KMO) values are between 0 and 1. 
When its value is 0 it means that the summation of partial correlations is large relative to the 
summation of the correlations. On the other hand, if the KMO value is close to 1 it means that 
the patterns of correlations are compact thus the factor analysis will yield reliable factors. 
According to Kaiser (1974), KMO values are recommended to be accepted above 0.5. 
Hutcheson and Sofroniou (1999) understand that values between 0.5 and 0.7 are considered to 


33 
be normal, between 0.7 and 0.8 are good, between 0.8 and 0.9 are great while above 0.9 KMO 
values are considered to be superb. 
The KMO value for this research was 0.924 which the result was really good.
The Barlett’s Test of Sphericity, another indicator of the strength of the relationships among 
variables, tests a null hypothesis that states that the correlation matrix is an identity matrix. 
This hypothesis should be rejected. Our results showed that the significance level was small 
enough to reject the null hypothesis with a significance value of 0 and a Chi-Square value of 
7656.833. These results can be seen in appendix 3. 

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