老师您好，我在用安装好插件的spss26做1：n的PSM输出过程出现了这样的错误提示，请问老师这是哪个环节出现问题呢？但是最终也出现了匹配的队列，那这匹配后的队列能用来做分析吗？谢谢老师的解答！

Warning

Subsamples Warning Message

(all cases) (...): package 'optmatch' was built under R version 3.5.3

(...): package 'RItools' was built under R version 3.5.3

(...): package 'SparseM' was built under R version 3.5.3

FUN(...): Calling var(x) on a factor x is deprecated and will become an error.

 Use something like 'all(duplicated(x)[-1L])' to test for a constant vector.

FUN(...): Calling var(x) on a factor x is deprecated and will become an error.

 Use something like 'all(duplicated(x)[-1L])' to test for a constant vector.

FUN(...): Calling var(x) on a factor x is deprecated and will become an error.

 Use something like 'all(duplicated(x)[-1L])' to test for a constant vector.

FUN(...): Calling var(x) on a factor x is deprecated and will become an error.

 Use something like 'all(duplicated(x)[-1L])' to test for a constant vector.

FUN(...): Calling var(x) on a factor x is deprecated and will become an error.

 Use something like 'all(duplicated(x)[-1L])' to test for a constant vector.

FUN(...): Calling var(x) on a factor x is deprecated and will become an error.

 Use something like 'all(duplicated(x)[-1L])' to test for a constant vector.

FUN(...): Calling var(x) on a factor x is deprecated and will become an error.

 Use something like 'all(duplicated(x)[-1L])' to test for a constant vector.

FUN(...): Calling var(x) on a factor x is deprecated and will become an error.

 Use something like 'all(duplicated(x)[-1L])' to test for a constant vector.

chisq.test(...): Chi-squared approximation may be incorrect