Order ID 53563633773 Type Essay Writer Level Masters Style APA Sources/References 4 Perfect Number of Pages to Order 5-10 Pages
The data sets are in Stata data files called dentalregistration2021.dta and iifas and age2.dta on the Moodle page for the Introduction to Statistical Methods Course.
Save the files to a convenient location on your PC and read them into R. The data set contains variables that are ready for analysis and no recoding of variables is required, but you will need to label them appropriately and assign value labels to the variables where appropriate. You are expected to use both the R manual and the Introduction to Statistics manual to help you answer the questions.
Please check well in advance that you can access the data for analysis in case you have problems with this near the deadline!
When analysing the data and writing your report you should:
provide appropriate plots and /or tables to summarise the data
state and justify any assumptions you make,
describe the analysis you have done,
interpret the results in non-technical language
Your report should include the relevant sections of R output, copied and pasted into your document. Do not include R syntax in the output. You should ensure that your output and any plots you consider informative are appropriately and informatively labelled. [Do NOT print out and hand in the entire contents from the R console only include relevant output.]
Note that you do not have to analyse the data from every conceivable angle! A relatively simple analysis and clear interpretation will be appropriate.
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An investigation of infant feeding attitudes among pregnant women was carried out in Glasgow in 2001. Data were collected from a sample of 129 women attending the Southern General Hospital or Millbrae Antenatal Clinic. Women were interviewed antenatally and asked about their intended method of feeding breast or bottle. They were also asked to complete the Iowa Infant Feeding Attitude Scale (IIAFS), which results in a score between 17 and 85. The higher the score the more positive is the womans attitude to breastfeeding. The IIAFS was also completed by the person who would provide most support for the woman during pregnancy (i.e. husband, partner, mother, sister). The following data were recorded:
The data are stored in a Stata data file called iifas and age2.dta as follows:
WomanScr IIAFS score for the woman
SuppScr IIAFS score for main supporter
Age Womans age in years
Depcat2 Deprivation of area of residence 1: Affluent 2: Deprived
FeedInt Feeding intention at antenatal interview
1: Breastfeed 2: Bottle feed or undecided
Question 1 (total 29 marks)
a) What percentage of women intend to breastfeed in each deprivation level? Use an appropriate test and confidence interval to investigate whether the percentage who intend to breastfeed differs significantly between the two deprivation levels.
b) Is there any evidence of a difference in the average IIAFS scores of women who intend to breastfeed and those who intend to bottle-feed (or are undecided)?
c) Is there any evidence of a difference in the average IIAFS scores of the women and their supporters?
d) Is there any evidence of a relationship between womens IIAFS score and their age?
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Question 2 (total 16 marks)
a) A survey of the dental health of 5-year-old children was carried out in the east end of Glasgow. The numbers of decayed, missing and filled teeth were recorded for a random sample of 360 children. The area in which the study was carried out covered postcode sectors in deprivation categories 4, 6 and 7. One of the main questions of interest was whether there was a difference in the average number of sound teeth between children who had never been registered with a dentist (RegCat = 1), had previously been registered but now lapsed (RegCat = 2) and who were currently registered (RegCat = 3).
The data are stored in a Stata data file called dental registration2021. The variables of interest here are:
Sound: number of sound teeth
DepCat: deprivation category (4, 6 or 7)
RegCat: registration category (as defined above)
i) Is there any evidence of a difference in the average number of sound teeth between the 3 categories of registration?
ii) The investigator was concerned about the interpretation of this result on the grounds that registration category was likely to be associated with deprivation (which in turn is likely to influence dental health). Carry out an appropriate test to show that there is a significant association between registration category and the deprivation category of the postcode in which the children live.
Jan 20, 3:40 AM
Coursework needs to be done using the statistical software ‘R’. Datasets are simplistic and questions not very difficult. Datasets will be supplied to the successful bidder. Thanks
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