search for: t_ob

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2007 Nov 07
1
Homework help: t test hypothesis testing with summarized data?
...hen I don't have the actual data, but just the summarized statistics: > #Homework 9.2.6 [1] > n<-31 > xbar<-3.10 > s_x<-1.469 > m<-57 > ybar<-2.43 > s_y<-1.35 > s_pooled<- (((n-1)*s_x^2) + ((m-1)*s_y^2)) / (n + m - 2) > s_pooled [1] 1.939521 > t_obs <- (xbar - ybar) / (s_pooled * (sqrt(1/n + 1/m))) > t_obs [1] 1.547951 > qt(c(.025, .975), n+m-2) [1] -1.987934 1.987934 > # Therefore, fail to reject H0 at the 0.05 level of significance > Or am I again overlooking a canned procedure or an easier calculation using the t distribu...
2012 Sep 16
1
How to plot two lines, and only one line with errorbar by qqplots of R
Here is my code, which plots three lines with errorbar. How could I add an extra line without errorbar to the plot? Thank you very much. beta.data <- data.frame ( method = rep(c("Wrong", "Correct", "Full Bayes"), each = T_obs), mean.beta = c(mean.beta1, mean.beta2, mean.beta3), t = rep(points, 3), std.beta = c(std.beta1, std.beta2, std.beta3) ) limits = aes(ymin = mean.beta - std.beta, ymax = mean.beta + std.beta); maintitle = paste("beta function (std = ", std, ")", sep = ""); p + geo...