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Title Transcription
ヘイキン セイジュク ネンレイ ノ サンテイ シマネケン ニオケル ショチョウ チョウサ シリョウ オ レイ ニ
Title Alternative
Estimation of Mean Age to reach a Milestone : Age at Menarche in Schoolgirls in Shimane Prefecture
File
language
jpn
Author
Nagasawa, Sumio
Description
Several statistical methods for estimating the mean age to reach a milestone were compared using the status quo data on age at menarche in schoolgirls in Shimane prefecture. The material was collected in February 1977 ; it consisted of a random sample numbering 2431 girls aged 130 to 190 months. The records were classified into 3-month and one year age ranges. The standard probit and logit methods were applied to the former classified data to estimate parameters of the frequency distribution of age at menarche. Tocher's grouped probit and its approximation methods were applied to the latter classified data for the same purpose. The estimated mean ages were standard probit 12.562, standard logt 12.554, Tocher's grouped probit 12.564, and its approximation 12.560 years. The mean age 12.580 was also obtained by Spearman-Karber method from the former classified data. No great discrepancy in the estimated mean ages of menarche was noted for any method of analysis. The method determining the age per cent menstruating curve from the individual records that some girls had reached menarche whil eothers have not reached menarche yet was tried to get the mean age of menarche in a small sample of girls. This method could be used to estimate the mean age, if a set of small sample of girls covers enough range of ages, such that in the younger age group none of the girls has experienced menarche while in the older group all the girls have passed their menarche.
Journal Title
Bulletin of the Faculty of Agriculture, Shimane University
Volume
13
Start Page
181
End Page
189
ISSN
0370940X
Published Date
1979-12-15
NCID
AN00108015
Publisher
島根大学農学部
Publisher Aalternative
Shimane University, Faculty of Agriculture
NII Type
Departmental Bulletin Paper
OAI-PMH Set
Faculty of Life and Environmental Science
Remark
開学30周年記念号
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