More information: <https://www.stata.com/help.cgi?missing>
Integer missing values make the code '.', '.a', ..., '.z' to the ranges 101 ... 127 (for int8), 32741 ... 32767 (for int16) and 2147483621 ... 2147483647 (for int32). Missing values for floating point data types are more complex but the pattern is simple to discern from the following table.
np.float32 missing values (float in Stata) 0000007f . 0008007f .a 0010007f .b ... 00c0007f .x 00c8007f .y 00d0007f .z
np.float64 missing values (double in Stata) 000000000000e07f . 000000000001e07f .a 000000000002e07f .b ... 000000000018e07f .x 000000000019e07f .y 00000000001ae07f .z
The Stata missing value code
An observation's missing value.
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