Αποτελέσματα Αναζήτησης
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 a csv file from R into Stata and am not sure if there is a succinct way for replacing all the NA values with missing. I have tried: replace 'var'= "." if 'var'== "NA" .......
22 Σεπ 2023 · This column focuses on the easiest problems in which a researcher is clear, or at least highly confident, about what missing values should be instead, implying a deterministic replacement. The main tricks are copying values from observation to observation and using the ipolate command.
To change extended missing values back to numeric values, type . mvencode _all, mv(.a=98\ .b=99) This would leave sysmiss and all other extended missing values unchanged.
24 Ιουν 2021 · In Stata, I am trying to change the values--both string and numeric--of one row based on the one just above or just below it only if the values are missing. Here are some sample data: input str40 id
This presentation focuses on how to implement two of these methods Stata. Multiple Imputation (MI) Full information maximum likelihood (FIML) Other principled methods have been developed, for example Bayesian approaches and methods that explicitely model missingness.
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 .
