Google Sheets – How to Let Users Only Change Their Own Data

Now Google Drive has a feature called “filter views”. It makes some filters available only to you while you don't change any data.

Use filter views in the new Google Sheets

In Google Sheets, filtering your data makes it easier for you to view and analyse data by letting you hide data that you want to temporarily take out of view. The new Google Sheets introduces filter views as well, which allow you to create, name, and save filters that you can use without disrupting how others are viewing your spreadsheet.

Creating a filter view

When you create a filter view, it’s like saving a filter that you can use over and over again.

1. Open the spreadsheet where you would like to create a filter view.
2. Click the Data menu, hover over “Filter views…” and select Create a new filter view. You can also click the down arrow to the right of the filter icon and select Create a new filter view.
3. Using the down arrows in the column headers, sort and filter the data to fit your desired view. Your filter view will be saved as you make changes.
4. To close your new filter view, either click the X in the top-right corner of the spreadsheet or click the down arrow to the right of the filter icon and select None.

(Note: If you had existing shared filter on columns first remove that.)

Source.

see how many entries per day each person makes

For this the time of day (part of the timestamp in ColumnA) is not required, so I have inserted a ColumnB, labelled Day, with formula in B2 of:

=ArrayFormula(int(A2:A))

Then pivoted ColumnsB:C with range reduced to relevant rows (ie Sheet1!B1:C218) ), Day for Rows, Name for Columns and Day again for Values (Summarize by: COUNT), with Show totals unchecked for Rows and Columns.

Then selected the pivot table, Insert > Chart and chose Line chart. With other setting as defaults and a little formatting, the result (which I don't claim to be a meaningful measure of efficiency) was: