Lecture10_ANOVA30 - Effects of soil types on crop yield...

Info iconThis preview shows pages 1–16. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Effects of soil types on crop yield Sand Clay Loam Effects of soil types on crop yield Analysis of Variance Table Response: yield Df Sum Sq Mean Sq F value Pr(>F) soil 2 99.2 49.60 4.24 0.025 Residuals 27 315.5 11.69 Analysis of Variance: partition variance Treatment effects Residual variance Total variance 100 50 SS Total = SS Treatment + SS Residual Tukey HSD test in R Tukey HSD test in R >TukeyHSD(aov(yield~soil,data=dta)) $soil diff lwr upr p adj Loam-Clay 2.8 -0.9903777 6.5903777 0.1785489 Sand-Clay -1.6 -5.3903777 2.1903777 0.5546301 Sand-Loam -4.4 -8.1903777 -0.6096223 0.0204414 Mean Distribution of one sample Mean Uncertainty and confidence Uncertainty and confidence Standard deviation (/n) of sample means = standard error (SE) of the mean =1.96 if we know population variance: 95% CI = mean + Z* X SE if we dont know population variance: 95% CI = mean + t-value X SE If H If H is true, repeat the study is true, repeat the study Y 1 =Y 2 y 1 y 2 n=20 n=20 n=20 t t t t-distribution Critical t-value t-value= Difference between two means Standard error of difference Y 1 =Y 2 y 1 y 2 n=20 n=20 n=20 t t t t-distribution Critical t-value Difference between two means + 95%CI Difference between two means...
View Full Document

This note was uploaded on 01/12/2012 for the course ENVIRONMET 340 taught by Professor Dr.pan during the Winter '11 term at Portland State.

Page1 / 25

Lecture10_ANOVA30 - Effects of soil types on crop yield...

This preview shows document pages 1 - 16. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online