Revised Chapter 5

Chapter 5 Results and Discussion 5.1

Descriptive Statistics of Second Visit Data Variables

Table 2 shows the descriptive statistics of the second visit variables of interests (VI), TOTEX2 and TOTIN2. This was computed to provide a brief idea on how much a household spends and earns in a period of time, measure the differences of the statistics between the two variables and to compare the results with other tests later on. This descriptive statistics will be also used in comparing the results of imputation classes (IC), how well the observations are grouped.

Table 2: Descriptive Statistics using the complete data set

The average total spending of a household in the National Capital Region (NCR) is about Php 102389.80 while the average total earnings amounted to P134119.40, a difference of more than thirty thousand pesos. Observations from the TOTIN2 are larger and more spread than the TOTEX2 because of a larger mean and standard deviation respectively. The dispersion can be also seen by just looking at the minimum at maximum of the two variables. The range of TOTIN2 which measured more than four million against the range of TOTEX2 measured one million lower than TOTIN2 can be also a sign of the extreme variability of the observations.

5.2

Formation of Imputation Classes

Table 3 shows the results of the chi-square test where it was done to determine if the candidate matching variables (MV) are associated with the VIs. The MV stated in the methodology must be highly correlated to the variables of interest. The first visit variables of interest, TOTIN1 and TOTEX1, were grouped into four categories in order to satisfy the assumptions in the association tests. The first visit VIs were used in as the variables to be tested for association rather than second visit variables of interest since the second visit VIs already contained missing data.

The following candidate matching variables that were tested are the provincial area codes (PROV), recoded education status (CODES1) and recoded total employed household members (CODEP1). The PROV has four categories, CODES1 has three, and CODEP1 has also four. Originally, CODES1 and CODEP1 have more than what they have now. Since the original matching variables have numerous categories (i.e. In CODES1 and CODEP1, there were more than 60 and 7 categories respectively.), the matching variables were recoded and further categorized into smaller groups. The categories for CODES1 are as follows: 1 = At most a high school graduate 2 = At most a college graduate and other course that where not specified 3 = Taking Masters and Doctoral Degrees