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5.3 Other stratified designs 71Nitrogen 0.0 0.359.94 65.34Cutdate Nitrogen 0.0 0.3Jun11 18.73 22.48Jul01 56.40 61.50Jul22 76.25 84.72Aug12 88.40 92.67Standard errors of differences of meansTable Cutdate Nitrogen CutdateNitrogenrep. 8 16 4s.e.d. 3.004 0.514 3.091d.f. 5 10 5.59Except when comparing means with the same level(s) ofCutdate 1.027d.f. 10(Not adjusted for missing values)This example also shows how the analysis can cope with missing values as may occur ifa unit is damaged or, for some reason, fails to be measured. Here we have lost onecomplete plot and half another one. The residual degrees of freedom are adjusted (asshown in brackets) and the missing values are estimated as part of the analysis. Theanalysis involves approximations but, provided only a few units are missing, these shouldbe acceptable. (See the Guide to the GenStat Command Language, Part 2, Section 4.4 formore details.)