
############################################################################################################################################################
> ####### Upload data from Excel###########################################################################################################################
> nhanes5 <- D_S_Data  %>% mutate_if(is.character,as.factor)
> class(nhanes5)
[1] "tbl_df"     "tbl"        "data.frame"
> print(nhanes5)
# A tibble: 561 x 9
    SEQN Gender   Age SDMVPSU SDMVSTRA WTSA2YR Zinc_S Zinc_D Fasting
   <dbl>  <dbl> <dbl>   <dbl>    <dbl>   <dbl>  <dbl>  <dbl>   <dbl>
 1 83741      1    22       2      128  31201.   80.6   8.44       9
 2 83742      2    32       1      125  56483.   80.7   8          3
 3 83751      2    16       1      128  77496.   57.3   4.3        1
 4 83752      2    30       1      124  38172.   87.9   9.73       1
 5 83753      1    15       1      119  60525.   81.4  11.4       10
 6 83756      1    16       1      122  44825.   81.4  15.2        5
 7 83759      2    19       2      121 175767.  139.   15.0        2
 8 83762      2    27       1      132  48873.  122.    9.26       6
 9 83768      2    15       2      120 195690.   80.4   5.58      13
10 83770      1    15       2      132  50926.   70     7.98      10
# ... with 551 more rows
> 
> ######### Summary of Data################
> summary(nhanes5)
      SEQN           Gender           Age           SDMVPSU         SDMVSTRA        WTSA2YR      
 Min.   :83741   Min.   :1.000   Min.   :13.00   Min.   :1.000   Min.   :119.0   Min.   : 18595  
 1st Qu.:84405   1st Qu.:1.000   1st Qu.:16.00   1st Qu.:1.000   1st Qu.:122.0   1st Qu.: 48558  
 Median :85052   Median :2.000   Median :22.00   Median :1.000   Median :126.0   Median : 69262  
 Mean   :85060   Mean   :1.528   Mean   :22.74   Mean   :1.467   Mean   :126.1   Mean   :104401  
 3rd Qu.:85682   3rd Qu.:2.000   3rd Qu.:29.00   3rd Qu.:2.000   3rd Qu.:130.0   3rd Qu.:116485  
 Max.   :86421   Max.   :2.000   Max.   :35.00   Max.   :2.000   Max.   :133.0   Max.   :708844  
     Zinc_S           Zinc_D          Fasting      
 Min.   : 44.00   Min.   : 1.640   Min.   : 0.000  
 1st Qu.: 71.00   1st Qu.: 6.715   1st Qu.: 1.000  
 Median : 81.20   Median : 9.130   Median : 4.000  
 Mean   : 81.41   Mean   :10.163   Mean   : 5.934  
 3rd Qu.: 90.40   3rd Qu.:12.490   3rd Qu.:11.000  
 Max.   :139.10   Max.   :38.560   Max.   :29.000  
> 
> ###########Structure of the Data############
> str(nhanes5)
tibble [561 x 9] (S3: tbl_df/tbl/data.frame)
 $ SEQN    : num [1:561] 83741 83742 83751 83752 83753 ...
 $ Gender  : num [1:561] 1 2 2 2 1 1 2 2 2 1 ...
 $ Age     : num [1:561] 22 32 16 30 15 16 19 27 15 15 ...
 $ SDMVPSU : num [1:561] 2 1 1 1 1 1 2 1 2 2 ...
 $ SDMVSTRA: num [1:561] 128 125 128 124 119 122 121 132 120 132 ...
 $ WTSA2YR : num [1:561] 31201 56483 77496 38172 60525 ...
 $ Zinc_S  : num [1:561] 80.6 80.7 57.3 87.9 81.4 ...
 $ Zinc_D  : num [1:561] 8.44 8 4.3 9.73 11.39 ...
 $ Fasting : num [1:561] 9 3 1 1 10 5 2 6 13 10 ...
> 
> ######## Head of structure################
> head(nhanes5)
# A tibble: 6 x 9
   SEQN Gender   Age SDMVPSU SDMVSTRA WTSA2YR Zinc_S Zinc_D Fasting
  <dbl>  <dbl> <dbl>   <dbl>    <dbl>   <dbl>  <dbl>  <dbl>   <dbl>
1 83741      1    22       2      128  31201.   80.6   8.44       9
2 83742      2    32       1      125  56483.   80.7   8          3
3 83751      2    16       1      128  77496.   57.3   4.3        1
4 83752      2    30       1      124  38172.   87.9   9.73       1
5 83753      1    15       1      119  60525.   81.4  11.4       10
6 83756      1    16       1      122  44825.   81.4  15.2        5
> 
> ############Tail of structure############
> tail(nhanes5)
# A tibble: 6 x 9
   SEQN Gender   Age SDMVPSU SDMVSTRA WTSA2YR Zinc_S Zinc_D Fasting
  <dbl>  <dbl> <dbl>   <dbl>    <dbl>   <dbl>  <dbl>  <dbl>   <dbl>
1 86399      2    35       2      130  77879.   84.4  11.7       10
2 86402      1    19       2      122 158043.   91.7  14.6        0
3 86409      2    21       1      124  64143.   89.6  30.8       14
4 86410      1    16       2      131  59296.   97.1   7.69       6
5 86415      2    21       2      123  47978.   64.3   7.36       0
6 86421      2    15       2      126  37929.   83.3   9.07       0
> 
> ######Determine Column Names###############
> 
> colnames(nhanes5)
[1] "SEQN"     "Gender"   "Age"      "SDMVPSU"  "SDMVSTRA" "WTSA2YR"  "Zinc_S"   "Zinc_D"   "Fasting" 
> 
> ########################## Create Survey Weight Equation ##############################################################################################################
> library("survey")
> 
> nhc5 <- svydesign(id=~SDMVPSU, weights=~WTSA2YR, strata=~SDMVSTRA, nest=TRUE, survey.lonely.psu = "adjust", data= nhanes5)
> summary(nhc5)
Stratified 1 - level Cluster Sampling design (with replacement)
With (30) clusters.
svydesign(id = ~SDMVPSU, weights = ~WTSA2YR, strata = ~SDMVSTRA, 
    nest = TRUE, survey.lonely.psu = "adjust", data = nhanes5)
Probabilities:
     Min.   1st Qu.    Median      Mean   3rd Qu.      Max. 
1.411e-06 8.585e-06 1.444e-05 1.601e-05 2.059e-05 5.378e-05 
Stratum Sizes: 
           119 120 121 122 123 124 125 126 127 128 129 130 131 132 133
obs         31  48  48  37  25  39  33  38  34  28  29  39  46  52  34
design.PSU   2   2   2   2   2   2   2   2   2   2   2   2   2   2   2
actual.PSU   2   2   2   2   2   2   2   2   2   2   2   2   2   2   2
Data variables:
[1] "SEQN"     "Gender"   "Age"      "SDMVPSU"  "SDMVSTRA" "WTSA2YR"  "Zinc_S"   "Zinc_D"   "Fasting" 
> str(nhc5)  
List of 9
 $ cluster   :'data.frame':	561 obs. of  1 variable:
  ..$ SDMVPSU: Factor w/ 30 levels "119.1","119.2",..: 20 13 19 11 1 7 6 27 4 28 ...
  ..- attr(*, "terms")=Classes 'terms', 'formula'  language ~SDMVPSU
  .. .. ..- attr(*, "variables")= language list(SDMVPSU)
  .. .. ..- attr(*, "factors")= int [1, 1] 1
  .. .. .. ..- attr(*, "dimnames")=List of 2
  .. .. .. .. ..$ : chr "SDMVPSU"
  .. .. .. .. ..$ : chr "SDMVPSU"
  .. .. ..- attr(*, "term.labels")= chr "SDMVPSU"
  .. .. ..- attr(*, "order")= int 1
  .. .. ..- attr(*, "intercept")= int 1
  .. .. ..- attr(*, "response")= int 0
  .. .. ..- attr(*, ".Environment")=<environment: R_GlobalEnv> 
  .. .. ..- attr(*, "predvars")= language list(SDMVPSU)
  .. .. ..- attr(*, "dataClasses")= Named chr "numeric"
  .. .. .. ..- attr(*, "names")= chr "SDMVPSU"
 $ strata    :'data.frame':	561 obs. of  1 variable:
  ..$ SDMVSTRA: num [1:561] 128 125 128 124 119 122 121 132 120 132 ...
  ..- attr(*, "terms")=Classes 'terms', 'formula'  language ~SDMVSTRA
  .. .. ..- attr(*, "variables")= language list(SDMVSTRA)
  .. .. ..- attr(*, "factors")= int [1, 1] 1
  .. .. .. ..- attr(*, "dimnames")=List of 2
  .. .. .. .. ..$ : chr "SDMVSTRA"
  .. .. .. .. ..$ : chr "SDMVSTRA"
  .. .. ..- attr(*, "term.labels")= chr "SDMVSTRA"
  .. .. ..- attr(*, "order")= int 1
  .. .. ..- attr(*, "intercept")= int 1
  .. .. ..- attr(*, "response")= int 0
  .. .. ..- attr(*, ".Environment")=<environment: R_GlobalEnv> 
  .. .. ..- attr(*, "predvars")= language list(SDMVSTRA)
  .. .. ..- attr(*, "dataClasses")= Named chr "numeric"
  .. .. .. ..- attr(*, "names")= chr "SDMVSTRA"
 $ has.strata: logi TRUE
 $ prob      : Named num [1:561] 3.21e-05 1.77e-05 1.29e-05 2.62e-05 1.65e-05 ...
  ..- attr(*, "names")= chr [1:561] "1" "2" "3" "4" ...
 $ allprob   :'data.frame':	561 obs. of  1 variable:
  ..$ WTSA2YR: num [1:561] 3.21e-05 1.77e-05 1.29e-05 2.62e-05 1.65e-05 ...
 $ call      : language svydesign(id = ~SDMVPSU, weights = ~WTSA2YR, strata = ~SDMVSTRA, nest = TRUE, survey.lonely.psu = "adjust",      data = nhanes5)
 $ variables :'data.frame':	561 obs. of  9 variables:
  ..$ SEQN    : num [1:561] 83741 83742 83751 83752 83753 ...
  ..$ Gender  : num [1:561] 1 2 2 2 1 1 2 2 2 1 ...
  ..$ Age     : num [1:561] 22 32 16 30 15 16 19 27 15 15 ...
  ..$ SDMVPSU : num [1:561] 2 1 1 1 1 1 2 1 2 2 ...
  ..$ SDMVSTRA: num [1:561] 128 125 128 124 119 122 121 132 120 132 ...
  ..$ WTSA2YR : num [1:561] 31201 56483 77496 38172 60525 ...
  ..$ Zinc_S  : num [1:561] 80.6 80.7 57.3 87.9 81.4 ...
  ..$ Zinc_D  : num [1:561] 8.44 8 4.3 9.73 11.39 ...
  ..$ Fasting : num [1:561] 9 3 1 1 10 5 2 6 13 10 ...
 $ fpc       :List of 2
  ..$ popsize : NULL
  ..$ sampsize: int [1:561, 1] 2 2 2 2 2 2 2 2 2 2 ...
  ..- attr(*, "class")= chr "survey_fpc"
 $ pps       : logi FALSE
 - attr(*, "class")= chr [1:2] "survey.design2" "survey.design"
> ###################################################################################################################################################################################
> ### Subset 13-35
> 
> svycor(~Zinc_S + Zinc_D, design = nhc5)
       Zinc_S Zinc_D
Zinc_S   1.00   0.04
Zinc_D   0.04   1.00
> 
> out1 <- svycor(~Zinc_S + Zinc_D, design = nhc5)
> out1$cors
           Zinc_S     Zinc_D
Zinc_S 1.00000000 0.04171053
Zinc_D 0.04171053 1.00000000
> v <- svyvar(~Zinc_S + Zinc_D, design = nhc5)
> 
> as.matrix(v)
           Zinc_S    Zinc_D
Zinc_S 235.815646  3.098878
Zinc_D   3.098878 23.406959
attr(,"var")
          Zinc_S    Zinc_S    Zinc_D    Zinc_D
Zinc_S 94.576779  2.623090  2.623090 -1.934811
Zinc_S  2.623090  6.057128  6.057128 -1.815434
Zinc_D  2.623090  6.057128  6.057128 -1.815434
Zinc_D -1.934811 -1.815434 -1.815434  6.908094
attr(,"statistic")
[1] "variance"
> cov2cor(as.matrix(v))
           Zinc_S     Zinc_D
Zinc_S 1.00000000 0.04171053
Zinc_D 0.04171053 1.00000000
attr(,"var")
          Zinc_S    Zinc_S    Zinc_D    Zinc_D
Zinc_S 94.576779  2.623090  2.623090 -1.934811
Zinc_S  2.623090  6.057128  6.057128 -1.815434
Zinc_D  2.623090  6.057128  6.057128 -1.815434
Zinc_D -1.934811 -1.815434 -1.815434  6.908094
attr(,"statistic")
[1] "variance"
> 
> svyplot(Zinc_S ~ Zinc_D, design=nhc5, style="bubble" ,ylab=" Serum Zinc (µg/dL)", 
+         xlab="Dietary Zinc (mg)", main="Figure 3:Relationship between Serum & Dietary Zn (13-35-Year-Olds)")
> 
> smoother <- svysmooth(Zinc_S ~ Zinc_D,
+                       design=nhc5, bandwidth=10)
>  lines(smoother, col="blue", lwd=4)
> 

> #### 66+
>  ####### Upload data from Excel###########################################################################################################################
>  nhanes5 <- D_S_Data  %>% mutate_if(is.character,as.factor)
>  class(nhanes5)
[1] "tbl_df"     "tbl"        "data.frame"
>  print(nhanes5)
# A tibble: 285 x 9
    SEQN Gender   Age SDMVPSU SDMVSTRA WTSA2YR Zinc_S Zinc_D Fasting
   <dbl>  <dbl> <dbl>   <dbl>    <dbl>   <dbl>  <dbl>  <dbl>   <dbl>
 1 83734      1    78       1      131  38741.   98.7  15.4       10
 2 83737      2    72       1      128  62801.   88.9   5.67      12
 3 83755      1    67       1      126 340775.   91.3  10.5       13
 4 83758      1    80       2      133  27993.   79.7  14.2        4
 5 83773      2    80       1      131  23769.   94.4   5.72       2
 6 83775      2    69       2      119  36344.   89.4  11.2       10
 7 83787      2    68       1      128 108273.   57.4  18.7        1
 8 83788      2    69       2      120 104229.   68.9   4.43      15
 9 83789      1    66       1      132  57369.   72.8   4.98       0
10 83812      2    68       1      124 346820.   91.8  13.2        0
# ... with 275 more rows
>  
>  ######### Summary of Data################
>  summary(nhanes5)
      SEQN           Gender           Age           SDMVPSU         SDMVSTRA        WTSA2YR      
 Min.   :83734   Min.   :1.000   Min.   :66.00   Min.   :1.000   Min.   :119.0   Min.   : 22693  
 1st Qu.:84471   1st Qu.:1.000   1st Qu.:69.00   1st Qu.:1.000   1st Qu.:123.0   1st Qu.: 47959  
 Median :85262   Median :2.000   Median :74.00   Median :2.000   Median :127.0   Median : 68757  
 Mean   :85144   Mean   :1.519   Mean   :73.64   Mean   :1.502   Mean   :126.4   Mean   :116780  
 3rd Qu.:85792   3rd Qu.:2.000   3rd Qu.:80.00   3rd Qu.:2.000   3rd Qu.:130.0   3rd Qu.:120987  
 Max.   :86420   Max.   :2.000   Max.   :80.00   Max.   :2.000   Max.   :133.0   Max.   :657426  
     Zinc_S           Zinc_D          Fasting      
 Min.   : 45.80   Min.   : 0.880   Min.   : 0.000  
 1st Qu.: 69.20   1st Qu.: 6.080   1st Qu.: 1.000  
 Median : 79.20   Median : 8.640   Median : 4.000  
 Mean   : 79.05   Mean   : 9.537   Mean   : 5.754  
 3rd Qu.: 89.10   3rd Qu.:12.145   3rd Qu.:11.000  
 Max.   :120.70   Max.   :30.220   Max.   :17.000  
>  
>  ###########Structure of the Data############
>  str(nhanes5)
tibble [285 x 9] (S3: tbl_df/tbl/data.frame)
 $ SEQN    : num [1:285] 83734 83737 83755 83758 83773 ...
 $ Gender  : num [1:285] 1 2 1 1 2 2 2 2 1 2 ...
 $ Age     : num [1:285] 78 72 67 80 80 69 68 69 66 68 ...
 $ SDMVPSU : num [1:285] 1 1 1 2 1 2 1 2 1 1 ...
 $ SDMVSTRA: num [1:285] 131 128 126 133 131 119 128 120 132 124 ...
 $ WTSA2YR : num [1:285] 38741 62801 340775 27993 23769 ...
 $ Zinc_S  : num [1:285] 98.7 88.9 91.3 79.7 94.4 89.4 57.4 68.9 72.8 91.8 ...
 $ Zinc_D  : num [1:285] 15.37 5.67 10.52 14.18 5.71 ...
 $ Fasting : num [1:285] 10 12 13 4 2 10 1 15 0 0 ...
>  
>  ######## Head of structure################
>  head(nhanes5)
# A tibble: 6 x 9
   SEQN Gender   Age SDMVPSU SDMVSTRA WTSA2YR Zinc_S Zinc_D Fasting
  <dbl>  <dbl> <dbl>   <dbl>    <dbl>   <dbl>  <dbl>  <dbl>   <dbl>
1 83734      1    78       1      131  38741.   98.7  15.4       10
2 83737      2    72       1      128  62801.   88.9   5.67      12
3 83755      1    67       1      126 340775.   91.3  10.5       13
4 83758      1    80       2      133  27993.   79.7  14.2        4
5 83773      2    80       1      131  23769.   94.4   5.72       2
6 83775      2    69       2      119  36344.   89.4  11.2       10
>  
>  ############Tail of structure############
>  tail(nhanes5)
# A tibble: 6 x 9
   SEQN Gender   Age SDMVPSU SDMVSTRA WTSA2YR Zinc_S Zinc_D Fasting
  <dbl>  <dbl> <dbl>   <dbl>    <dbl>   <dbl>  <dbl>  <dbl>   <dbl>
1 86365      1    68       1      121 275449.   56.7   7.90      14
2 86377      2    76       2      120  39650.   80.7  10.0       14
3 86383      2    78       1      133  96171.  100    16.1        0
4 86386      1    72       1      124  63286.   89.1   3.62       1
5 86406      1    80       1      119  85123.   86.5   9.85       1
6 86420      1    80       1      130 104832.   83     3.66      12
>  
>  ######Determine Column Names###############
>  
>  colnames(nhanes5)
[1] "SEQN"     "Gender"   "Age"      "SDMVPSU"  "SDMVSTRA" "WTSA2YR"  "Zinc_S"   "Zinc_D"   "Fasting" 
>  
>  ########################## Create Survey Weight Equation ##############################################################################################################
>  library("survey")
>  
>  nhc5 <- svydesign(id=~SDMVPSU, weights=~WTSA2YR, strata=~SDMVSTRA, nest=TRUE, survey.lonely.psu = "adjust", data= nhanes5)
>  summary(nhc5)
Stratified 1 - level Cluster Sampling design (with replacement)
With (30) clusters.
svydesign(id = ~SDMVPSU, weights = ~WTSA2YR, strata = ~SDMVSTRA, 
    nest = TRUE, survey.lonely.psu = "adjust", data = nhanes5)
Probabilities:
     Min.   1st Qu.    Median      Mean   3rd Qu.      Max. 
1.521e-06 8.265e-06 1.454e-05 1.591e-05 2.085e-05 4.407e-05 
Stratum Sizes: 
           119 120 121 122 123 124 125 126 127 128 129 130 131 132 133
obs         17  11  18  12  17  15  30  19  28  25  13  20  19  26  15
design.PSU   2   2   2   2   2   2   2   2   2   2   2   2   2   2   2
actual.PSU   2   2   2   2   2   2   2   2   2   2   2   2   2   2   2
Data variables:
[1] "SEQN"     "Gender"   "Age"      "SDMVPSU"  "SDMVSTRA" "WTSA2YR"  "Zinc_S"   "Zinc_D"   "Fasting" 
>  str(nhc5)  
List of 9
 $ cluster   :'data.frame':	285 obs. of  1 variable:
  ..$ SDMVPSU: Factor w/ 30 levels "119.1","119.2",..: 25 19 15 30 25 2 19 4 27 11 ...
  ..- attr(*, "terms")=Classes 'terms', 'formula'  language ~SDMVPSU
  .. .. ..- attr(*, "variables")= language list(SDMVPSU)
  .. .. ..- attr(*, "factors")= int [1, 1] 1
  .. .. .. ..- attr(*, "dimnames")=List of 2
  .. .. .. .. ..$ : chr "SDMVPSU"
  .. .. .. .. ..$ : chr "SDMVPSU"
  .. .. ..- attr(*, "term.labels")= chr "SDMVPSU"
  .. .. ..- attr(*, "order")= int 1
  .. .. ..- attr(*, "intercept")= int 1
  .. .. ..- attr(*, "response")= int 0
  .. .. ..- attr(*, ".Environment")=<environment: R_GlobalEnv> 
  .. .. ..- attr(*, "predvars")= language list(SDMVPSU)
  .. .. ..- attr(*, "dataClasses")= Named chr "numeric"
  .. .. .. ..- attr(*, "names")= chr "SDMVPSU"
 $ strata    :'data.frame':	285 obs. of  1 variable:
  ..$ SDMVSTRA: num [1:285] 131 128 126 133 131 119 128 120 132 124 ...
  ..- attr(*, "terms")=Classes 'terms', 'formula'  language ~SDMVSTRA
  .. .. ..- attr(*, "variables")= language list(SDMVSTRA)
  .. .. ..- attr(*, "factors")= int [1, 1] 1
  .. .. .. ..- attr(*, "dimnames")=List of 2
  .. .. .. .. ..$ : chr "SDMVSTRA"
  .. .. .. .. ..$ : chr "SDMVSTRA"
  .. .. ..- attr(*, "term.labels")= chr "SDMVSTRA"
  .. .. ..- attr(*, "order")= int 1
  .. .. ..- attr(*, "intercept")= int 1
  .. .. ..- attr(*, "response")= int 0
  .. .. ..- attr(*, ".Environment")=<environment: R_GlobalEnv> 
  .. .. ..- attr(*, "predvars")= language list(SDMVSTRA)
  .. .. ..- attr(*, "dataClasses")= Named chr "numeric"
  .. .. .. ..- attr(*, "names")= chr "SDMVSTRA"
 $ has.strata: logi TRUE
 $ prob      : Named num [1:285] 2.58e-05 1.59e-05 2.93e-06 3.57e-05 4.21e-05 ...
  ..- attr(*, "names")= chr [1:285] "1" "2" "3" "4" ...
 $ allprob   :'data.frame':	285 obs. of  1 variable:
  ..$ WTSA2YR: num [1:285] 2.58e-05 1.59e-05 2.93e-06 3.57e-05 4.21e-05 ...
 $ call      : language svydesign(id = ~SDMVPSU, weights = ~WTSA2YR, strata = ~SDMVSTRA, nest = TRUE, survey.lonely.psu = "adjust",      data = nhanes5)
 $ variables :'data.frame':	285 obs. of  9 variables:
  ..$ SEQN    : num [1:285] 83734 83737 83755 83758 83773 ...
  ..$ Gender  : num [1:285] 1 2 1 1 2 2 2 2 1 2 ...
  ..$ Age     : num [1:285] 78 72 67 80 80 69 68 69 66 68 ...
  ..$ SDMVPSU : num [1:285] 1 1 1 2 1 2 1 2 1 1 ...
  ..$ SDMVSTRA: num [1:285] 131 128 126 133 131 119 128 120 132 124 ...
  ..$ WTSA2YR : num [1:285] 38741 62801 340775 27993 23769 ...
  ..$ Zinc_S  : num [1:285] 98.7 88.9 91.3 79.7 94.4 89.4 57.4 68.9 72.8 91.8 ...
  ..$ Zinc_D  : num [1:285] 15.37 5.67 10.52 14.18 5.71 ...
  ..$ Fasting : num [1:285] 10 12 13 4 2 10 1 15 0 0 ...
 $ fpc       :List of 2
  ..$ popsize : NULL
  ..$ sampsize: int [1:285, 1] 2 2 2 2 2 2 2 2 2 2 ...
  ..- attr(*, "class")= chr "survey_fpc"
 $ pps       : logi FALSE
 - attr(*, "class")= chr [1:2] "survey.design2" "survey.design"
>  #############
>  
>  svycor(~ Zinc_S + Zinc_D, design = nhc5)
       Zinc_S Zinc_D
Zinc_S   1.00   0.04
Zinc_D   0.04   1.00
>  
>  out2 <- svycor(~Zinc_S + Zinc_D, design = nhc5)
>  out2$cors
           Zinc_S     Zinc_D
Zinc_S 1.00000000 0.03504753
Zinc_D 0.03504753 1.00000000
>  
>  
>  
>  svyplot(Zinc_S ~ Zinc_D, design=nhc5, style="bubble" ,ylab=" Serum Zinc (µg/dL)", 
+          xlab="Dietary Zinc (mg)", main="Figure 3:Relationship between Serum & Dietary Zn (66+)")
>  
>  smoother <- svysmooth(Zinc_S ~ Zinc_D,
+                        design=nhc5, bandwidth=10)
>  lines(smoother, col="blue", lwd=4)