bdf.RdThe bdf data frame has 2287 rows and 25 columns of language
scores from grade 8 pupils in elementary schools in The Netherlands.
bdfa factor denoting the school.
a factor denoting the pupil.
a numeric vector of verbal IQ scores
a numeric vector of IQ scores.
Sex of the student.
a factor indicating if the student is a member of a minority group.
an ordered factor indicating if one or more grades have been repeated.
a numeric vector
a numeric vector
a numeric vector
a numeric vector
a numeric vector
a numeric vector of socioeconomic status indicators.
a factor indicating of the school is a public school, a Protestant private school, a Catholic private school, or a non-denominational private school.
a numeric vector
a numeric vector
a factor with levels 0 and 1
a numeric vector
a numeric vector
a factor indicating if the class is a mixed-grade class.
a numeric vector
a numeric vector
a numeric vector
a numeric vector
a numeric vector
http://stat.gamma.rug.nl/snijders/multilevel.htm, the first edition of http://www.stats.ox.ac.uk/~snijders/mlbook.htm.
Snijders, Tom and Bosker, Roel (1999), Multilevel Analysis: An Introduction to Basic and Advanced Multilevel Modeling, Sage.
summary(bdf)
#> schoolNR pupilNR IQ.verb IQ.perf sex
#> 40 : 35 17001 : 1 Min. : 4.00 Min. : 5.000 0:1194
#> 155 : 33 17002 : 1 1st Qu.:10.50 1st Qu.: 9.333 1:1093
#> 183 : 31 17003 : 1 Median :12.00 Median :11.000
#> 54 : 31 17004 : 1 Mean :11.83 Mean :11.047
#> 159 : 31 17005 : 1 3rd Qu.:13.00 3rd Qu.:12.667
#> 161 : 31 17006 : 1 Max. :18.00 Max. :17.667
#> (Other):2095 (Other):2281
#> Minority repeatgr aritPRET classNR aritPOST
#> N:2155 0:1988 Min. : 1.00 Min. : 180 Min. : 2.00
#> Y: 132 1: 295 1st Qu.: 9.00 1st Qu.: 6780 1st Qu.:14.00
#> 2: 4 Median :12.00 Median :14180 Median :20.00
#> Mean :11.94 Mean :13382 Mean :19.44
#> 3rd Qu.:14.00 3rd Qu.:19580 3rd Qu.:25.00
#> Max. :20.00 Max. :25880 Max. :30.00
#>
#> langPRET langPOST ses denomina schoolSES
#> Min. :11.00 Min. : 9.00 Min. :10.00 1:775 Min. :10
#> 1st Qu.:30.00 1st Qu.:35.00 1st Qu.:20.00 2:803 1st Qu.:16
#> Median :35.00 Median :42.00 Median :27.00 3:617 Median :18
#> Mean :34.19 Mean :40.93 Mean :27.81 4: 92 Mean :19
#> 3rd Qu.:39.00 3rd Qu.:48.00 3rd Qu.:35.00 3rd Qu.:22
#> Max. :49.00 Max. :58.00 Max. :50.00 Max. :29
#>
#> satiprin natitest meetings currmeet mixedgra
#> Min. :2.143 0:1056 Min. :1.100 Min. :1.000 0:1658
#> 1st Qu.:3.143 1:1231 1st Qu.:1.800 1st Qu.:1.667 1: 629
#> Median :3.286 Median :2.000 Median :1.833
#> Mean :3.325 Mean :2.055 Mean :1.973
#> 3rd Qu.:3.571 3rd Qu.:2.300 3rd Qu.:2.167
#> Max. :4.000 Max. :3.600 Max. :3.333
#>
#> percmino aritdiff homework classsiz
#> Min. : 0.000 Min. : 8.00 Min. :1.333 Min. :10.00
#> 1st Qu.: 0.000 1st Qu.:13.00 1st Qu.:2.000 1st Qu.:23.00
#> Median : 0.000 Median :15.00 Median :2.667 Median :27.00
#> Mean : 6.579 Mean :16.15 Mean :2.462 Mean :26.51
#> 3rd Qu.: 6.000 3rd Qu.:19.00 3rd Qu.:2.667 3rd Qu.:31.00
#> Max. :90.000 Max. :27.00 Max. :3.667 Max. :39.00
#>
#> groupsiz IQ.ver.cen avg.IQ.ver.cen grpSiz.cen
#> Min. : 5.0 Min. :-7.8341 Min. :-5.0841 Min. :-18.1006
#> 1st Qu.:17.0 1st Qu.:-1.3341 1st Qu.:-0.4174 1st Qu.: -6.1006
#> Median :24.0 Median : 0.1659 Median : 0.1059 Median : 0.8994
#> Mean :23.1 Mean : 0.0000 Mean : 0.0000 Mean : 0.0000
#> 3rd Qu.:28.0 3rd Qu.: 1.1659 3rd Qu.: 0.5231 3rd Qu.: 4.8994
#> Max. :37.0 Max. : 6.1659 Max. : 1.8993 Max. : 13.8994
#>
## More examples, including lme() fits reproducing parts in the above
## book, are available in the R script files
system.file("mlbook", "ch04.R", package ="nlme") # and
#> [1] "/tmp/RtmpMUryCq/temp_libpath2c541d7ae17d25/nlme/mlbook/ch04.R"
system.file("mlbook", "ch05.R", package ="nlme")
#> [1] "/tmp/RtmpMUryCq/temp_libpath2c541d7ae17d25/nlme/mlbook/ch05.R"