formula

I want to run linear regression for the same outcome and a number of covariates minus one covariate in each model. I have looked at the example on this page but could that did not provide what I wanted. Sample data a <- data.frame(y = c(30,12,18), x1 = c(7,6,9), x2 = c(6,8,5), x3 = c(4,-2,-3), x4 = c(8,3,-3), x5 = c(4,-4,-2)) m1 <- lm(y ~ x1 + x4 + x5, data = a) m2 <- lm(y ~ x2 + x4 + x5, data = a) m3 <- lm(y ~ x3 + x4 + x5, data = a) How could I run these models in a short way and and without repeating the same covariates again and again? Backlin Following this example you could do this:

I have created a worksheet, out.xls which had cell D6=D5*2 and D5 set to 1. My issue is that when I plug a value into D5 in jxl, D6 never calculates. D6 simply holds on the value it initially calculated when I plugged in 1 to D5 in excel. note: I have a much larger programming problem that I am trying to tackle, this is just a very scaled down version to reduce error. This is my first time ever use Jexcel and I only just learned java this last year, so any help would be appreciated. I spent 6 hours yesterday trying to find an answer on the web, but to no avail. the output is attached below the

I have this table, which can be seen as a basic custom gantt chart: And I would like to fill the A column with start dates, based on the first filled cell of the range on the same row, and the header value of its respective column (row 1). It's easier to show my expected result than write it actually: Thanks very much for your help! In A2 try this formula copied down =IF(COUNTA(B2:Z2),INDEX(B$1:Z$1,MATCH(TRUE,INDEX(B2:Z2<>"",0),0)),"") you may have to format column A with the required date format assumes data up to column Z, adjust as required 来源： https://stackoverflow.com/questions/11153987

在一个项目的某一个查询场景中，TEACHER表是主表，STUDENT表是TEACHER的子表，两者是以一对多的方式关联。业务逻辑需要查询多条TEACHER表的数据，并且在查询出每条A表数据的同时还需要将对应STUDENT表的行数取出来。我们当然可以利用Hibernate先将每条TEACHER数据load进来以后再以TEACHER.getStudents().size()这种方式取得对应的行数，但是代码会显得很繁琐并且增加了许多需要执行的SQL语句，有没有什么替代的方法呢？ 我们可以使用Hiberante的formula。 为了解决前面提到的问题，我们只需要在TEACHER 的orm配置文件里加上这样一个property，定义其formula属性如下： ... <property name="rowCount" formula="(select count(*) from STUDENT a where a.ID=teacherId)" type="java.lang.String" /> ... 通过这种方式我们就可以在取得每一个TEACHER持久化对象的时候就方便的得到了需要的统计信息，可以大幅度的提高我们的开发效率。注意这里不单单可以用来统计记数，还可以用于sum，avg等其他统计。 在Hibernate 3.x之前，formula属性只能够出现在property元素中。