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How can I replace missing values with previous or following nonmissing values or within sequences? 1. The problems. Users often want to replace missing values by neighboring nonmissing values, particularly when observations occur in some definite order, often (but not always) a time order.
31 Ιουλ 2020 · I have imported an excel data in Stata which contains 16 variables (2 string variables and 14 numeric variables) with some missing values (specifically "n.a." type of missing values) and all efforts to delete the "n.a." or replace them with recognized stata missing values such as "."
23 Ιουλ 2013 · Take a look at replacing missing values with neighboring values FAQ and at user-written xfill. The latter is useful for filling in static variables. It replaces missing values in a cluster with the unique non-missing value within that cluster.
22 Σεπ 2023 · There are two main devices at this easy end to fill in missing values: copying down or forward from observation to observation and using interpolation in its simplest form, namely, linear interpolation as supported by ipolate (see [D] ipolate).
As part of the code to relabel missing values by type, you can include code that searches for these changes. The following code replaces multiple values and looks for positive versions of the missing values in outliers.
Method 1: Using command replace. We can manually replace missing values with “.a ” for -999, “.b ” for -99 and .c for the rest of missing values. For example, for variable female, we can do the following: replace female = .a if female == -999. replace female = .b if female == -99. replace female = .c if female >= -3 & female < 0. list, clean .
This module will explore missing data in Stata, focusing on numeric missing data. It will describe how to indicate missing data in your raw data files, as well as how missing data are handled in Stata logical commands and assignment statements.
