Sunscreen Protection Factor (SPF): Single sample data (eg0.txt)


Data on tolerance to sunlight (minutes) for 13 patients prior and after treatment
with a sunscreen. (Ramsey and Schafer, 1996, page 106)



Data Display

 Row    pre   post  post/pre

   1     30    120    4.0000
   2     45    240    5.3333
   3    180    480    2.6667
   4     15    150   10.0000
   5    200    480    2.4000
   6     20    270   13.5000
   7     15    300   20.0000
   8     10    180   18.0000
   9     20    300   15.0000
  10     20    240   12.0000
  11     60    480    8.0000
  12     60    300    5.0000
  13    120    480    4.0000



Descriptive Statistics


Variable             N       Mean     Median     TrMean      StDev    SE Mean
pre                 13       61.2       30.0       53.2       64.6       17.9
post                13      309.2      300.0      310.9      131.0       36.3
post/pre            13       9.22       8.00       8.86       6.00       1.66

Variable       Minimum    Maximum         Q1         Q3
pre               10.0      200.0       17.5       90.0
post             120.0      480.0      210.0      480.0
post/pre          2.40      20.00       4.00      14.25



Character Stem-and-Leaf Display

Stem-and-leaf of post/pre  N  = 13
Leaf Unit = 1.0

    2    0 22
    6    0 4455
    6    0 
   (1)   0 8
    6    1 0
    5    1 23
    3    1 5
    2    1 
    2    1 8
    1    2 0