Page 216 - Contributed Paper Session (CPS) - Volume 6

CPS1892 Yang Xinhong
The population variance of "NOF" amount within strata of "gold and
jewelry wholesale", "flower retail", "mobile phone wholesale" and "other big
self-employed households" can be calculated by the following formula:
2
ℎ 2
̂
( ) = ∑ (∑ ) . ℎ ⁄ ℎ (4)
ℎ

ℎ=1 =1
Nh represents the total number of units within stratum h, nh represents
2
the number of samples within stratum hi S h represents the population
variance of stratum hi and Ai represents the total operating income of
population units.
The population variance of "NOF" amount within strata of "general self-
employed households" can be calculated by the following formula:
2
̂
( ) = ∑ ( − ). ℎ ⁄ ℎ (5)
ℎ
ℎ
ℎ
ℎ
ℎ=1
Nh represents the total number of units within stratum hi represents the
2
number of samples within stratum hi and S h represents the population
variance of stratum h.
The variance of "NOF" amount of sample units within strata of "gold and
jewelry wholesale", "flower retail", "mobile phone wholesale" and "other big
self-employed households" can be calculated by the following formula:

The variance of the proportion of "NOF" in financing operating capital
within strata of "gold and jewelry wholesale", "flower retail", "mobile phone
wholesale" and "other big self-employed households" can be calculated by
the following formula:

In the interval estimation formula, ∑ ℎ is the total financing operating

=1
capital within the strata (operating income in the statistical statement by
Foreign Trade and Economic Cooperation Office of the Shenzhen Statistics
Bureau + turn of capital); yi/αi is the proportion of "NOF" in the operating
capital raised of the sample units (data calculated in this survey).
2.3 The Organization and Implementation of the Survey
2.3.1 Set up a survey team to carry out the survey of sample units.
A "NOF" survey team is set up, which is composed of survey interviewers,
managers of the markets where self-employed households operate and

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