[mata问题求助] stata非参数回归报错所有观测都违反了识别条件，求助大神 [推广有奖]

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chinazero 发表于 2024-3-14 21:14:45 |AI写论文

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warning: 8956 observations were not used to compute the mean function because they
      violated the model identification assumptions. These observations are
      marked as 1 in the system variable _unident_sample. You may use the
      unidentsample() option to use a different variable name.

all observations violate identification condition
Most likely, you have included a discrete covariate without specifying factor
variable notation. npregress interprets the variable to be continuous.  Please
use i.varname for discrete covariates.
r(198);
请大神指教，为什么所有观测值都违反识别条件。