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The GRM is saved in binary form and generated with the [GCTA](https://cnsgenomics.com/software/gcta/#Overview) `--make-grm-bin` command. The binary `grm-bin` file can be imported into `grmsem` using the `grm.bin.input.R()` function.
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## Phenotype files
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**Z-standardised** phenotype files are created in wide-format and need to be imported with individual observations **in the order** of the constructed GRM matrix, as given, for example, in [GCTA](https://cnsgenomics.com/software/gcta/#Overview) (2-column file: family ID, individual ID).
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**Z-standardised** phenotype files are created in wide-format and need to be imported with individual observations **in the order** of the constructed GRM matrix, as given, for example, in [GCTA](https://cnsgenomics.com/software/gcta/#Overview) grm.id files (2-column file: family ID, individual ID).
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Phenotype files have a header, but no IDs. The number of phenotypes in the file determines the number of phenotypes **k** in the model. An example of a tri-variate phenotype is shown below:
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