Therefore, this study aimed to evaluate the performance of the PM-FAO methodologies for missing data
and Hargreaves & Samani (1985) as alternatives to the FAO Penman-Monteith method at different time scales and seasons for the municipalities of Linhares and Sao Mateus, located in the Northern region of the state of Espirito Santo, Brazil.
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These single-year models are effective with sparse data and short periods of missing data
but fail to use or incorporate all the information available in long term monitoring data sets.
A naive imputation method is the random draw, which imputes missing data
with a randomly drawn nonmissing value from the same variable.
In the six centers, 363 patients were retrieved for this observational study, although 61 were excluded due to lost follow-up and another six due to missing data
(e.g., no treatment information).
However, this method is generally appropriate only when the chosen dataset contains a very small amount of missing data
, for example, 5% missing rate.
Traditional method to handle missing data
is discarding those samples with missing values, which is generally called listwise deletion.
Interpolation based methods estimate the missing data
according to an average or weighted average of known data which is neighboring the missing data
But the data have a lot of missing values: 62.2% for phosphate, 59.9% for nitrate, 27.22% for pH, etc., and the size of missing data
varies from one-third hour to several months.
Data not available or beyond the first three days of patients' admission were defined as "missing data
." BChE (U/L) had categories of <4500 and [greater than or equal to] 4500; age (years) of <30 and [greater than or equal to] 30; WHO stage of I, II, III, and IV; CD4 count (cells/[micro]L) of missing data
, <50 and [greater than or equal to] 50; HIV-RNA (copies/mL) of missing data
, < [10.sup.5] and [greater than or equal to] [10.sup.5]; hemoglobin (g/L) of missing data
, <110 and [greater than or equal to] 110; serum concentration of sodium (mmol/L) of missing data
, <130 and [greater than or equal to] 130; and albumin (g/L) of missing data
, <35 and [greater than or equal to] 35.
After being asked about the missing data
, the spokesman said: "The data that you state is missing is in fact only missing from our website.