The Ledermann bound is given by the solution *k* for
*(M - k)^2 >= M + k*, where *M* is
the number of
indicator variables. The maximum possible number of factors is the largest
integer smaller than or equal *k*.

1 |

`M` |
an integer indicating the number of indicator variables or a matrix of data, in which case ncol(M) is used as the number of indicator variables. |

The Ledermann bound, a positive real number.

Paul Gilbert and Erik Meijer

Tom Wansbeek and Erik Meijer (2000) *Measurement
Error and Latent Variables in Econometrics*, Amsterdam: North-Holland.
(note p169.)

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