[英]R: paired t-test on multiple columns
I am trying to run a t-test on multiple columns.我正在尝试对多个列进行 t 检验。 Basically trying to find the change from baseline to year 1 for a number of joint angles.基本上试图找到一些关节角度从基线到第 1 年的变化。 I only want to conduct this on the study side.我只想在学习方面进行。 Below is an image with the first few rows and columns of the data.下面是包含数据的前几行和几列的图像。 Sample Data样本数据
I have tried using both of these functions without success:我尝试使用这两个功能都没有成功:
Code 1:代码 1:
res <- FAI_SLS %>%
filter(study_side == "Study")%>%
select(-id,-subject,-activity,-side,-study_side,-year) %>%
map_df(~ broom::tidy(t.test(. ~ year)), .id = 'var')
I get the following error:我收到以下错误:
Error in eval(predvars, data, env) : object 'year' not found eval 中的错误(predvars、data、env):找不到对象“年份”
I tried taking out -year but I still have the same issue.我尝试取出 -year 但我仍然有同样的问题。
Code 2:代码 2:
t(sapply(FAI_SLS%>%filter(study_side == "Study")%>%select(-id,-subject,-activity,-side,-study_side,-year), function(x)
unlist(t.test(x~FAI_SLS$year)[c("estimate","p.value","statistic","conf.int")])))
I get the following error:我收到以下错误:
Error in h(simpleError(msg, call)) : error in evaluating the argument 'x' in selecting a method for function 't': variable lengths differ (found for 'FAI_SLS$year') h(simpleError(msg,call))中的错误:在为函数“t”选择方法时评估参数“x”时出错:可变长度不同(为“FAI_SLS$year”找到)
Again I tried taking -year out without success.我再次尝试退出 - 年但没有成功。
Any suggestions on how I can fix this?关于如何解决这个问题的任何建议? Thanks谢谢
Try fitting the t-test within summarise()
on all the columns you want to test (selected in across()
).尝试在要测试的所有列上拟合summarise()
内的 t 检验(在across()
中选择)。 Here's an example with a different dataset:这是一个使用不同数据集的示例:
library(dplyr)
library(tidyr)
data("storms")
storms %>%
filter(year %in% c(2019, 2020)) %>%
summarise(across(-c(name, year, status, category),
~broom::tidy(t.test(. ~ year)))) %>%
pivot_longer(everything(), names_to = "variable") %>%
unnest(value)
#> # A tibble: 9 × 11
#> variable estimate estimate1 estimate2 statistic p.value parameter conf.low
#> <chr> <dbl> <dbl> <dbl> <dbl> <dbl> <dbl> <dbl>
#> 1 month 0.0917 8.93 8.84 1.15 2.52e- 1 892. -0.0654
#> 2 day 4.29 18.2 13.9 7.49 2.34e-13 641. 3.17
#> 3 hour -0.0596 9.13 9.19 -0.128 8.99e- 1 687. -0.978
#> 4 lat 2.14 25.9 23.7 3.75 1.94e- 4 668. 1.02
#> 5 long 6.06 -60.7 -66.8 4.27 2.25e- 5 736. 3.27
#> 6 wind 8.42 58.8 50.4 4.42 1.18e- 5 529. 4.68
#> 7 pressure -4.46 989. 993. -3.03 2.59e- 3 537. -7.35
#> 8 tropicalst… 7.39 153. 145. 0.810 4.18e- 1 701. -10.5
#> 9 hurricane_… 10.9 24.1 13.2 3.92 1.02e- 4 508. 5.45
#> # … with 3 more variables: conf.high <dbl>, method <chr>, alternative <chr>
Created on 2022-06-02 by the reprex package (v2.0.1)由reprex 包创建于 2022-06-02 (v2.0.1)
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