Table of Contents

## What percentage of missing data is acceptable for multiple imputation?

In a literature, when more than 10% of data are missing, estimates are likely to be biased (9). Another paper mentioned that 5% of missing rate has been suggested as a lower cutoff point below which MI provides insignificant benefit (10). However, those cutoff points have a limited evidence to support them.

## What percentage of missing values should be dropped?

Generally, if less than 5% of values are missing then it is acceptable to ignore them (REF). However, the overall percentage missing alone is not enough; you also need to pay attention to which data is missing.

**How many missing values is too many?**

Statistical guidance articles have stated that bias is likely in analyses with more than 10% missingness and that if more than 40% data are missing in important variables then results should only be considered as hypothesis generating [18], [19].

**How much missing data is too much for FIML?**

You should look at how sample statistics differ for variables without missing for those with 50% or 33% missing(on other variables) versus those without that missingness. 33% missing may still be too high. You should discuss this with a statistical consultant.

### What if more than 50% are missing in a column variable How can we impute?

If the information contained in the variable is not that high, you can drop the variable if it has more than 50% missing values.

### How many missing values is acceptable in SPSS?

Scheffer (2002) suggests complete cases can be used if no more than 6% of the data is missing, single imputation if no more than 10% of the data is missing and more complex procedures such as multiple imputation if between 10% and 25% of the data is missing.

**How do you handle missing values when they are more than 30% in data?**

You are given a data set consisting of variables with more than 30 percent missing values. How will you deal with them?

- We can just simply remove the rows with missing data values.
- It is the quickest way, we use the rest of the data to predict the values.

**Why do we remove variables with a high missing value ratio?**

In the case of multivariate analysis, if there is a larger number of missing values, then it can be better to drop those cases (rather than do imputation) and replace them. On the other hand, in univariate analysis, imputation can decrease the amount of bias in the data, if the values are missing at random.

#### Why do we remove variables with the high missing value ratio?

#### Should I impute missing data?

If more than 25% of the data is missing and researchers apply modern treatments to impute the missing data, then they should always compare the results of their subsequent analyses with the results they would have obtained if they had used complete case analysis.

**What to do if you have a lot of missing data?**

Best techniques to handle missing data

- Use deletion methods to eliminate missing data. The deletion methods only work for certain datasets where participants have missing fields.
- Use regression analysis to systematically eliminate data.
- Data scientists can use data imputation techniques.

**Why is the mean imputation not considered as a good practice of data imputation for a low sample?**

Problem #1: Mean imputation does not preserve the relationships among variables. True, imputing the mean preserves the mean of the observed data. So if the data are missing completely at random, the estimate of the mean remains unbiased.

## What is the best way to impute missing data?

Imputation Techniques

- Complete Case Analysis(CCA):- This is a quite straightforward method of handling the Missing Data, which directly removes the rows that have missing data i.e we consider only those rows where we have complete data i.e data is not missing.
- Arbitrary Value Imputation.
- Frequent Category Imputation.

## What are the disadvantages of multiple imputation?

Similar to the maximum likelihood technique, a disadvantage of multiple imputation is that it assumes the data to be missing at random (MAR).

**Why is it a bad idea to use averaging to impute missing values?**

**How do you compensate for missing data?**

Seven Ways to Make up Data: Common Methods to Imputing Missing Data

- Mean imputation.
- Substitution.
- Hot deck imputation.
- Cold deck imputation.
- Regression imputation.
- Stochastic regression imputation.
- Interpolation and extrapolation.

### Why is multiple imputation good?

Multiple imputation is a general approach to the problem of missing data that is available in several commonly used statistical packages. It aims to allow for the uncertainty about the missing data by creating several different plausible imputed data sets and appropriately combining results obtained from each of them.